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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4
votes
3answers
583 views

The time is approximately 10:10

Watches in advertisements tend to be set to 10:10 (unless you're Apple). The reason seems to be that the hands are symmetrical when they're at 10:10. Except they're not. The hour hand moves ...
4
votes
1answer
507 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 ...
4
votes
1answer
334 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 ...
3
votes
8answers
9k views

How many minutes is it before 12 noon? (tricky)

This puzzle is a one I met in an IQ test. I believe it's so tricky, however, the concept is quite simple. How many minutes is it before 12 noon if 68 minutes ago it was three times as many minutes ...
3
votes
2answers
503 views

Your age and my age [closed]

This is not a very difficult problem, but it seems that it hasn't been asked here. It's one of my favorites, so here we go: I am twice as old as you were when I was as old as you are. When you ...
3
votes
5answers
588 views

Curiosity of February 5$^{th}$

Some people write February 5$^{th}$ using the md format, as $2.5$ or alternatively as $2/5$. Note that $2.5 \times \frac25 = 1$. Is there any other date satisfying $a.b \times \frac{a}{b} = 1$? ...
3
votes
1answer
263 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?
3
votes
3answers
692 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 ...
3
votes
2answers
358 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, ...
3
votes
1answer
383 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 ...
2
votes
3answers
192 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 ...
2
votes
3answers
174 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 ...
2
votes
3answers
913 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 ...
1
vote
4answers
714 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?
1
vote
2answers
3k 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 ...
1
vote
2answers
136 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.
1
vote
2answers
246 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 ...
1
vote
2answers
214 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. ...
1
vote
2answers
629 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 ...
1
vote
1answer
95 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 ...
0
votes
2answers
257 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 ...
-1
votes
2answers
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?
-1
votes
1answer
163 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
-1
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1answer
153 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
-3
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3answers
210 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 ...
-3
votes
1answer
533 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 ...
-3
votes
1answer
92 views

Daylight And Standard Time Not Equal Timespan Yet Works Out [closed]

I have been thinking about this for a long time now, and no one can answer it. I forget the exact length span, however, the span for each is not equal. For example, DST is 120 days, and "standard" ...
-4
votes
3answers
124 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?
-7
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5answers
357 views

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?

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