# 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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### Please find the next number in this sequence: 121, 25, 36, 49, 16, 9,?

Here is the sequence: 121, 25, 36, 49, 16, 9, ? What should be written instead of the question mark? Note: Angles in a clock (seconds aren't considered)
192 views

### And how long was YOUR pregnancy?

A group of 10 new mothers in a support group, each with a single baby, compare the lengths of their pregnancies. The difference between the longest and shortest pregnancy is 32 days, and the group's ...
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1 vote
154 views

### Next date in the future that satisfies the following conditions

When is the next time that a date will satisfy the following conditions: YYYY days from MM/DD/YYYY is also the (DD)th day of a month. Note that YYYY stands for the year. All eight digits of MM/DD/...
311 views

### Times of a hidden order

The goal is to find the 6th time of a set of six different times on a clock. In order for this set of times to be complete, what time must replace the question mark? As usual, explain why.
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229 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 ...
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 ...
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171 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 ...
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?
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436 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 ...
395 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 ...
726 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 ...
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### 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 ...
475 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 ...
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467 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 ...
• 121
418 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 ...
1 vote
200 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 ...
226 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, ...
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 ...
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937 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 ...
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946 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 ...
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402 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. ...
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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 ...
• 148k
852 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 ...
• 148k
341 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, ...
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### 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 ...
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234 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 ...
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453 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, ...
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1 vote
190 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 ...
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360 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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328 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 ...
352 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
161 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 ...
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 ...
336 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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1 vote
244 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. ...
• 21
252 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 ...
• 1,563
1 vote
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 ...
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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 ...
• 36.5k
362 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:
150 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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279 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 ...
• 5,762
392 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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638 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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636 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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656 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. ...
• 793
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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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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210 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 ...
• 311
2k 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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