# 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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### 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, ...
3k views

### Timepieces and Moving Parts

The sundial keeps time with the fewest number of moving parts. Which timepiece has the most moving parts?
490 views

### Connecting 3 circular power timers to lights so that they turn for one day on Christmas

My friend gave a question to me. I am not sure if it is an original puzzle, but he has 2 lines of Christmas lights and 3 circular timers with 96 switches apiece. Each switch turns on power for 15 ...
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?
701 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 ...
593 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?
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 ...
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 ...
540 views

### Halve time with two timers

Two motorized 24-hour light timers are daisy chained between a power outlet and a light bulb. For these timers, devise schedules and choose initial times that produce the following repeated lighting ...
737 views

### Odd hours with two timers

Two motorized 24-hour light timers are daisy chained between a power outlet and a light bulb. For these timers, devise schedules and choose initial times that produce the following repeated 9-hour ...
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 ...
2k views

### A mosquito is born at T=0 and after 2 seconds makes a new mosquito every second, how many mosquitos at T=8.5? [closed]

One mosquito is born at T=0 and after 2 seconds it makes a new mosquito, and another every second thereafter. All such mosquitoes have this same property and do not die. How many mosquitoes there are ...
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 ...
164 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 ...
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 ...
502 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 ...
A says to B My age is twice of what your age was when I was of your age. B says to A If you add your current age to twice of your age when I was born, the answer is $63$. Assuming they both ...