# 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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258 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?
634 views

### What should be 'the next time'?

A question was asked in a mental ability test (which ended on Saturday). What comes next in this pattern of time: 2:25, 4:34, 1:57, 6:16, ___ Note: 1. No extra information is given like 12/24 ...
353 views

### Digital Alarm Clock

Most of the alarm clock's bulbs are busted as shown above in black shades. Although still working it is not possible to tell what time is it. If we can fix it to display a pattern every seconds, ...
347 views

### The st-t-tuttering clock

I came downstairs and set my new clock to 12 pm. Its Sunday. I go back to work on Monday. My shift starts at 12pm, in a days time. Unbeknownst to me, the clock is defective. At 45 seconds into the ...
190 views

### What happened there between Alice and Bob

So our favourite couple, Alice and Bob finally decided to get married ;) Bob was already working in a well reputed company as Information Security Analyst. Alice, used to get bored at home, so she ...
163 views

### Safety Fuses and Matches [duplicate]

You have 2 safety fuses and 4 matches. Each fuse takes exactly one hour to burn, but they are not perfect so may not necessarily burn evenly from both sides. For example, the first half might burn in ...
700 views

### The poorly designed clock [duplicate]

I gave a mental ability test today in which this question was asked. The hour and minute hands of a clock are indistinguishable. How many minutes are there in a day (24 hours) when it is not ...
592 views

### Clock time Puzzle

What will be the time when the hour, minute, and second hands will all coincide in between 6 O'Clock and 7 O'Clock? How should I approach this type of question? Can anyone explain it?
2k views

### Time Sequence Puzzle

If Thursday was the day after the day before yesterday five days ago, what is the least number of days ago when Sunday was three days before the day after tomorrow? Please explain each step of your ...
234 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 ...
212 views

### X past X, Y to Y

While sitting in the waiting hall a wall clock caught my attention. I realise there are only 15 minutes left for the conversation that will determine my path in life. I then took a glance at my watch. ...
500 views

### Time Sequence Puzzle (Days)

I found the following problem in a book and don't understand exactly what is being asked. (I) Kamal is available at home from 12 noon to 4 p.m. on Tuesday, thursday and Sunday. (II) His ...
156 views

### Speeding up half way [duplicate]

On my way to the supermarket, I walk at a certain speed. I want my average speed for the back and forth trip to be twice that speed. At what speed should I go back home to reach that goal?
152 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
205 views

### How to restore the scrambled master clock? [closed]

I don't know how the master clock, with which other clocks in the world are synchronized, is setup. who decided the mechanism used to setup the master clock when the master clock was setup how to ...
427 views

### Two burning ropes measure 5 minutes

Today I was at a job interview and the last question was, "How can I measure 5 minutes by lighting two ropes that each take an hour to burn but do not burn uniformly?" (classical). I know how to ...