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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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-3 votes
1 answer
219 views

What day of the week I am?

I am the day of the week that wants to be the first day of a year that is a perfect power. I do not like odd years. In order to be a perfect power, the year must end one day of the week later than the ...
Thirdy Yabata's user avatar
11 votes
4 answers
3k views

Prove there's a day of the week for each number in a year

Prove, or disprove, that each day of the week (Monday to Sunday), falls on every date number 1 to 30 in the space of a year. I.e. Prove there is a Monday 1st, Tuesday 1st, ..., Sunday 1st in the time ...
Beastly Gerbil's user avatar
2 votes
1 answer
154 views

Unique day of the year

I made this challenge. Astronomers announced that the sky and the moon will appear violet-velvet next week, and one of their workmates is also celebrating her birthday on the day that the moon will ...
Thirdy Yabata's user avatar
7 votes
1 answer
1k views

When was the power restored?

The power went out last night. The stove clock is flickering and showing 7:54 AM. The cell phone shows 7:07 AM. When was the power restored?
orangeskid's user avatar
0 votes
1 answer
417 views

Special birthday

I made this challenge. Aica will celebrate her birthday next week. When she wrote the date format of her birthday in the form of M/D/YYYY, she noticed that her birthday will fall in a quarter of a ...
Thirdy Yabata's user avatar
2 votes
1 answer
383 views

Special wedding date and time

I made this challenge. Later this decade, Amelia and Jack operates a restaurant where they serve a lot of tasty meals and delicious product. Recently, their income from the restaurant is triple more ...
Thirdy Yabata's user avatar
3 votes
1 answer
669 views

Rotational Symmetry on Digital Clock

In the NPR Sunday Puzzle recently, the "weekly challenge" asked about what times on a digital clock (not using military i.e. 00-24:00 time) would read the same if the clock was turned upside ...
DreiCleaner's user avatar
2 votes
1 answer
241 views

What was the date of Michael's birth?

Michael was so obsessed with his birthday that he always held his birthday party on the exact date and time of his birth. But he didn't hold his birthday for 8 years (he held his 16th birthday and ...
Etack Sxchange's user avatar
8 votes
1 answer
468 views

Twelve friends born on month ends

Twelve close friends were born on the last dates of their respective birth months. Fascinatingly, their birth months are different. On 30th June 2023, all twelve of them had gathered for the birthday ...
chandanr777 's user avatar
-3 votes
1 answer
405 views

Entry and Exit of people in pizza delivery shop

Similar problem at: https://brainly.in/question/38234304 Five people went to a pizza delivery shop at different times on a Sunday morning. They spent exactly 15 mins, 16 mins, 20 mins, 25 mins and 35 ...
Fin27's user avatar
  • 111
6 votes
1 answer
411 views

Clock hands get it Right

I was asked this question in an entrance exam. In one day, how many times the hour hand and the minute hand of a clock are at right angles to each other? My answer was 48. My reasoning was that during ...
user avatar
1 vote
2 answers
191 views

At what time did John arrive home?

John has quite a curious clock at home. Every hour it rings a bell as many times as the number of hours (At 2 o´clock it rings twice, at 3 o´clock thrice and so on), and it rings only once at a ...
Green CheeseWheel's user avatar
2 votes
1 answer
219 views

Eating my toasts before work

I work remotely as a software engineer, and because I like sleeping as much as possible I always leave my alarm clock set to the last possible minute. Problem is, today I did not hear my alarm go off, ...
Green CheeseWheel's user avatar
20 votes
1 answer
3k views

Are there seven consecutive annual dates which result in Monday-Sunday?

Choose a date that's a Monday, e.g. 1st Jan 2024. Then keep adding 1 year until you have seven dates in a row that are the days of the week in order (Monday to Sunday). Does such a date combination ...
rybo111's user avatar
  • 4,945
17 votes
1 answer
925 views

Time (and a place) for an odd-one-out puzzle

This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?. It is a tough task to create an 'odd-one-out' type puzzle whose solution lacks any ambiguity at all - it is all ...
Stiv's user avatar
  • 142k
13 votes
1 answer
937 views

Horological Horrors

This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?. I was visiting my grandfathers workshop one day, when he received a call and had to run out for a bit. He told ...
gabbo1092's user avatar
  • 6,000
2 votes
1 answer
399 views

Another predictable sequence: 1, 1, 2, 2, 1, 17, etc

This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?. Can you find the pattern? Note: The next number hasn't been worked out yet. ...
Scratch---Cat's user avatar
21 votes
1 answer
3k views

Time to get a watch

This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?. Last weekend I caught up with a friend I hadn't seen in a while. I went round his house on the Friday night ...
Stiv's user avatar
  • 142k
18 votes
2 answers
817 views

Only time will tell

This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?. Please help. I'm an intelligence officer, and I've got a crisis on my hands - my boss has gone missing! I came ...
Stiv's user avatar
  • 142k
3 votes
1 answer
338 views

Blind Date and Times

This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?. I was going on a blind date with a fellow puzzler and they sent me this: I didn't end up going on the date, ...
Spencer Fleming's user avatar
30 votes
3 answers
1k views

A Ticking Time Bomb

This puzzle is part of the Monthly Topic Challenge #6: Is it really that [time] again?. You wake up, finding yourself sitting in a room you've never seen before. Around the room there are loads of ...
TakingNotes's user avatar
  • 3,449
0 votes
1 answer
205 views

Measure time with 2 ropes [duplicate]

You are given two ropes that when lit burn in one hour. Which one of the following time periods CANNOT be measured with your ropes? a) 50 min b) 30 min c) 25 min d) 35 min. I know 30 minutes is ...
quantrader23's user avatar
4 votes
2 answers
445 views

Dark time in prison

You wake up. It is pitch dark. You don't know where you are. You feel groggy. The last thing you remember is being in a bar, a sexy young woman appeared out of nowhere, walked straight at you, ...
Florian F's user avatar
  • 29.9k
1 vote
0 answers
186 views

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 ...
Suzuna Minami's user avatar
3 votes
1 answer
354 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....
I'm Nobody's user avatar
  • 1,334
3 votes
2 answers
326 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 ...
Moris Bostari's user avatar
6 votes
1 answer
339 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. ...
Dmitry Kamenetsky's user avatar
1 vote
1 answer
159 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 ...
friedemann_bach's user avatar
-3 votes
3 answers
192 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 ...
Benjamin Curran's user avatar
4 votes
3 answers
329 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 ...
TSLF's user avatar
  • 6,656
1 vote
1 answer
239 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. ...
idunno's user avatar
  • 21
3 votes
2 answers
247 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 ...
Chris Steinbeck Bell's user avatar
1 vote
0 answers
99 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 ...
Dmitry Kamenetsky's user avatar
10 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 ...
Dmitry Kamenetsky's user avatar
2 votes
1 answer
358 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:
furrylolll's user avatar
3 votes
1 answer
147 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 ...
Pspl's user avatar
  • 2,262
6 votes
1 answer
275 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 ...
FlanMan's user avatar
  • 5,722
11 votes
1 answer
389 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 ...
Keelhaul's user avatar
  • 12.7k
15 votes
1 answer
633 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 ...
FlanMan's user avatar
  • 5,722
3 votes
3 answers
495 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'...
user795826's user avatar
14 votes
0 answers
646 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. ...
Omicron Zed's user avatar
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. :(
Voldemort's Wrath's user avatar
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 ...
DrD's user avatar
  • 39.2k
3 votes
1 answer
206 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 ...
Léreau's user avatar
  • 311
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?
ThomasL's user avatar
  • 12.2k
16 votes
1 answer
627 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 ...
TSLF's user avatar
  • 6,656
1 vote
2 answers
202 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.
Cedric Zoppolo's user avatar
7 votes
2 answers
480 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:...
HelloWorld1337's user avatar
-1 votes
1 answer
180 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
Tom's user avatar
  • 70.5k
27 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 ...
melfnt's user avatar
  • 5,132