# 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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### time taken by slower wine crusher [closed]

Two Grape Crushers take 4 days to crush certain amount of grapes.If one of them crushed half the grapes and the other crushed other half , then they complete the job in 9 days. How many days will it ...
248 views

### The hour glasses! [duplicate]

You have two hour glasses: A seven minute one and an 11 minute one. Using just these two hour glasses, accurately time 15 minutes.
416 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?
280 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 ...
141 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.
411 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:...
11k views

### Finding Day Puzzles

When the day after tomorrow becomes yesterday, the day which would then be today will be as far from Sunday as the day which is yesterday when it's two days after that day's tomorrow. What day of the ...
170 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
970 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 ...
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)?
127 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?
344 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 ...
233 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 soā¦ crazy thing, IMHO. Anyway, I don't, I'll start partying in 4886 days.Ā¹ Why do ...
98 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 ...
635 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 ...
832 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 ...
285 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 ...
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 ...
231 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....
265 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?
155 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
557 views

### “Musical chair” for clock hands

A colleague and me usually make bets on the time when a simulation is finished. Next time I would suggest the following: At the time the simulation is finished we take a look at the analog clock on ...
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?
20k views

### Meeting of hands on a clock

We have a regular analog clock with three hands - second, minute and hour. On a given day, how many times do: (a) the minute and hour hands (b) the minute and second hands (c) the hour and second ...
447 views

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### Another Twin Puzzle: Three Days Difference

Today is my first day joining my college's Puzzle Club. It is so much fun gathering in a group with similar interests! I meet a lot of new friends and of course asked their contact number to discuss ...
913 views

### One More Twin Puzzle: Four Days Difference?

This is updated version for Another Twin Puzzle: Three Days Difference Today is my first day joining my college's Puzzle Club. It is so much fun gathering in a group with similar interests! I meet a ...
499 views

### A Final Twins Puzzle: Twelve Days Difference?

Inspired by @athin's One More Twin Puzzle: Four Days Difference? After reading @athin's question, I was inspired to ask my own puzzle club about their birthdays. One of the members, Ethan, surprised ...
260 views

### What is it this Time?

Most clocks tell the time, but some are for letters. ...
3k views

### This puzzle is late!

I meant to release this puzzle 15Ā¼ hours ago, and forgot again just over 9ā hours ago. But don't worry, it's fine. The puzzle is finally out. What is this puzzle about? NB: What timezone I am in or ...
2k views

### Finally, you wake up from a coma

You can barely open your eyes when a doctor walks up to you: You are a lucky one. Not many people have survived an accident like this. Only a handful of neurosurgeons are able to perform such an ...