Questions tagged [time]

Puzzles which include the concept of time, as for instance: clocks, dates, calendars, conversions from one time zone to another, time-intervals.

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I wonder what that would be

This is my own puzzle. Consider the following Alice begins march for peace in East Bengal along with Gandhi Bentley celebrated the first Bahia Independence Day Catherine saw the starting of the Great ...
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3 votes
1 answer
304 views

A strange corporate

The employees of corporate "Clocks" have a fixed rule for working hours. All the employees start working at 16:00 and finish their work by 21:00. They take exactly one break during that time....
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3 votes
2 answers
217 views

What time is it? (High School Logic Question)

You need to find out what time it is. The logic question allegedly asked of middle school children in Russia. I think the question has more than one answer. So to clear my confusion, I will ask you to ...
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4 votes
1 answer
279 views

A prime time traveler

It is the year 2140 and you have just turned 40. After years of research, you have finally invented the time machine! It is a small device that fits in your pocket and allows you to travel in time. ...
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1 vote
1 answer
140 views

Zettler's Encyclopedia

On epiphany 1735, Sir Zettler, who was a great publisher from the old continent, promised to issue a "Great Universal Encyclopedia of Collectible Wisdom". It was meant to be affordable for ...
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-3 votes
3 answers
185 views

Twisted Timekeeping [closed]

Two office workers need to arrive at work at the exact same time. However that's not likely to happen because the only thing they use for telling the time is their watches and their timekeeping is a ...
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4 votes
3 answers
239 views

Doing Time In Prison

A prisoner was awoken by an earthquake that caused his wall clock to fall to the floor and rolled in the corner of his cell. When the ground stops shaking, he learns that the clock is still working ...
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  • 6,596
1 vote
1 answer
191 views

Puzzle storm to infinity

I have been playing Puzzle Storm on Lichess lately. Essentially it involves solving chess puzzles within a given time limit. Additionally, the player gets a time bonus for a certain number of moves. ...
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3 votes
2 answers
184 views

On which date was Marina born?

The puzzle is as follows: In 2012, which began on a Sunday, Marina was happy because her birthday was on a Saturday and she celebrated it with her friends. We know, Marina was born in a year where ...
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0 votes
0 answers
96 views

Nine touching clocks [duplicate]

There are nine 12-hour clocks arranged in a 3x3 grid, as shown in the diagram. The long minute handles of the left two clocks are touching, while the others are not. Two minute handles touch if they ...
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9 votes
1 answer
1k views

Four touching clocks

There are four 12-hour clocks arranged in a 2x2 grid, as shown in the diagram. The long minute handles of the left two clocks are touching, while the others are not. Two minute handles touch if they ...
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2 votes
1 answer
333 views

What is the date displayed for the question mark?

Someone sent me these images. It's about the Moon for some reason. Anyways, here are the images: And also that someone gave me a bonus:
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3 votes
1 answer
131 views

An altered Alan Parrish question

I was wondering around on Puzzling when I saw this question posted three days ago. It is a great puzzle and it reminded me me about another puzzle a saw a long ...
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6 votes
1 answer
203 views

When is the full moon?

During each lunar cycle, the full moon is technically full for one instant, but to the human observer, the moon appears full for 2-3 days and nights in a row, making it hard to tell on which date and ...
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  • 5,630
10 votes
1 answer
356 views

The Alan Parrish question

Two stereotypical british gentlemen that don't know each other engage in this unusual conversation (it's almost as if they were a setup for a puzzle): Gentleman A - Hello sir, I'll have you know that ...
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  • 12.6k
15 votes
1 answer
602 views

Explain this holiday calendar oddity

Happy Boxing Day! Yesterday was Christmas Day, and in a few days, it will be New Year's Day. Each holiday season, those two holidays are always on the same day of the week (in this case, Friday). But ...
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  • 5,630
3 votes
3 answers
221 views

After how many minutes will both hour hand and minute hand lie on one another

The following question was part of my mock test and I was unable to solve it. Assuming that: A: The hour hand and minute hand of the clock move without jerking B: The clock shows a time between 8 o'...
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13 votes
0 answers
555 views

Qubes: Oh, For the Love Of

TL;DR: This is a mixture between a tribute/spin-off puzzle and an attempt at a new puzzle type, greatly inspired by the notorious arcade game, Q*bert, published originally by Gottlieb Amusement Games. ...
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5 votes
3 answers
2k views

But wait! We skipped a day!

Today is October 4th and tomorrow will be October 6th. Explain! Note: I just thought of this one day and decided to post it here. Please don't leave too many downvotes. :(
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13 votes
3 answers
2k views

A stopped watch shows correct time ---

You know the old saying A slow or fast running watch is worse than a stopped (broken) watch. At least the stopped watch shows correct time twice a day! Here is a challenge: A person was wearing a ...
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2 votes
1 answer
191 views

Lazy Box Sorting

In front of Louis there are 10 boxes containing different foods: tomatoes, (red) herrings, and bananas. The boxes are arranged side by side in a line. Right next to the last box are three bigger ...
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  • 301
6 votes
5 answers
1k views

Probability of three identical digits on a four-digit digital clock?

On a digital clock showing 00:00 to 23:59, what is the probability of having exactly three identical digits?
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  • 11.5k
16 votes
1 answer
557 views

The Odd Street Clocks

The clockmaker took a walk after a lunch from a restaurant and across the block corner he found the old clock box with four similar looking clocks on every wall. It is in the middle of the street ...
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  • 6,596
1 vote
2 answers
160 views

Measure nine minutes with two hourglasses [duplicate]

How can you measure 9 minutes with a 7-minute hourglass and a 4-minute hourglass? Note: In this question it states where it's possible or not but not the actual procedure for this exact situation.
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7 votes
2 answers
469 views

Puzzle - Counting Lights, Not Sheep

Some nights it is difficult to get to sleep. On one such night, John counted the number of LEDs (Light-Emitting Diodes) on his clock radio that was on to make each individual time from 10:00 PM to 12:...
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-1 votes
1 answer
177 views

A sensitive lent

The number of days from the first day of Lent to the last day, inclusive, may be best described by: a) XL b) Xl + VI
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25 votes
1 answer
1k views

Using burning ropes as timer - how to measure 1 hour and 8 minutes with 3 ropes?

This is a variation of a well known puzzle, you can find the other versions on PSE. You have three ropes and a box with ten matches. As usual each rope takes one hour to burn completely when lighted ...
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  • 4,723
-4 votes
3 answers
157 views

Previous palindrome date

2nd of February this year will be a palindrome date, because 02/02/2020 reads the same forwards and backwards. But when was the previous palindrome date?
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5 votes
1 answer
253 views

Why do I celebrate later? (still 13,37 years)

A very little time ago, just a bit ago one may say, people started partying. Some even went out of their houses to do so… crazy thing, IMHO. Anyway, I don't, I'll start partying in 4886 days.¹ Why do ...
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  • 215
4 votes
1 answer
367 views

Using burning ropes as timers

This puzzle is an harder version of a very famous one. It has been asked many times on PSE, but this time the question is slightly different (1) (2). So please read this question twice before marking ...
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  • 4,723
1 vote
1 answer
115 views

Date from 2 wooden cube puzzle [duplicate]

In an interview the interviewer asked me a question based on date. Suppose in a office, at the manager's desk there are 2 wooden cubes to show the date of month, every day the manager sets the cubes ...
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6 votes
7 answers
4k views

If the second hand goes backwards, starting from 12:00, how long does it take to meet with the minute hand?

If the second hand of a clock goes backwards, starting from 12:00, how long does it take until it meets with the minute hand (which is going forwards)?
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0 votes
2 answers
838 views

Witches' Coffee [closed]

Two witches make a nightly visit to an all-night coffee shop. Each arrives at a random time between 0:00 and 1:00. Each one of them stays for exactly 30 minutes. On any one given night, what is the ...
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3 votes
1 answer
269 views

Infinite dials to reset ever?

I have an infinite number of dials with red needles that rotate $n\in\mathbb{Z^+}$ times every second. They all start pointing North. Will they simultaneously all point North ever again?
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6 votes
2 answers
1k views

What's Bob's age again?

I created this problem myself, but I did have inspiration. Today is a special day, I'm moving out of my parent's house. My father comes to me and says "Wow, you're half my age. On the day we moved ...
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  • 2,738
-1 votes
1 answer
156 views

When was Sia born? [closed]

John was born on 15 August 2007. If Sia is 17 year older than John. On which day Sia was born? Tuesday, Wednesday, Monday, Friday
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4 votes
3 answers
264 views

A Second Hand Question

" It is a very simple question", said Grandpa " Look at that wall clock and tell me exactly how many times the Second Hand passes directly over the Minute and the Hour Hands in a 24 hour period....
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  • 38.8k
16 votes
5 answers
983 views

You cannot have 120 degrees of separation, but how close can you get?

If you take a look at a standard three-hand gear-driven analog clock, there is never(see footnote) a time of day where the hands of the clock divide the face equally into 120 degree segments, but you ...
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  • 1,085
55 votes
12 answers
12k views

A clock correct three times a day

A stopped clock tells the right time twice a day. How fast must a clock go for it to be right three times a day?
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  • 5,298
10 votes
6 answers
848 views

Short Puzzle: Graphic Painting

The artist in the market is giving this painting for free (the last one on his rack). I asked him if I can take it but he replied "Why should I give it to you?" The frame could be useful but I dont ...
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  • 6,596
4 votes
5 answers
458 views

Time-Motion puzzle

Time and Motion studies are well established. Here is an easy question: It takes 8 men 6 months to build 2 houses at a cost of $50,000. It takes 10 men 5 months to build 3 houses at a cost of ...
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  • 35.4k
24 votes
3 answers
2k views

Digital Clock Brightness

My alarm clock has a typical 7-segment digital display showing hours and minutes. Every lit segment is equally bright, and every unlit segment is equally dark. The separator (:) is always lit. ...
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  • 635
11 votes
4 answers
1k views

Mirrored clocks

Triangulating for the simplest puzzle that is still at least somewhat interesting to solve.. On the left side wall in this picture, we have two particular clocks: 1: an analog clock with identical ...
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  • 68.9k
4 votes
2 answers
906 views

What timezone am I?

It was 17:52 in the evening and I couldn’t wait for my class to finish. Only 8 more minutes… I really hate night school! I sat there pondering the stuff on the blackboard and wondering why he wrote it ...
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4 votes
2 answers
275 views

Switching the clock

"Observe the time, would you, Watson, old chap?" I did as instructed and glanced at the large grandfather clock standing in the corner. "Just a little after 4.42, Holmes." He nodded, "So when the ...
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  • 2,587
1 vote
2 answers
280 views

What are the chances on watching the clock? [closed]

This is a relatively straightforward little puzzle, but the answers are somewhat unintuitive or can prompt a new perspective. It might be an interesting little puzzle for a probability teaching ...
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  • 747
-8 votes
5 answers
544 views

A cowboy rodeo riddle [closed]

First, the cowboy went to the rodeo on Monday. Three days later, he went back home on Friday. Can you solve it?
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17 votes
14 answers
11k views

My birthday is uncommon

I was born 1 day after my sibling. Yesterday was my sibling's birthday but today is not my birthday. When is my birthday?
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  • 289
30 votes
11 answers
13k views

Born on the same day, but one is two years older

Two people were born on the same day, same year, and share the same birthday. One is 2 years old, the other is only a few days old. What's going on here?
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  • 581
9 votes
2 answers
291 views

Where are you at this time

Where are you if, When it's 10 o'clock, it's 2 o'clock When it's 5 o'clock, it's 7 o'clock
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