Linked Questions

4
votes
3answers
192 views

Two Fuses Burn for 45 Minutes [duplicate]

You have two pieces of delay fuse. One burns for 1 hour and the other burns for 30 minutes. Without a watch, clock, or timepiece at all... can you beyond any shadow of a doubt tell me when 45 minutes ...
2
votes
3answers
156 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 ...
3
votes
1answer
241 views

How can I solve my meditation problem? [duplicate]

I have been given a guide on how to reach satisfaction, and part of this guide requires me to meditate exactly for 90 minutes. I have only been provided 2 oil-soaked ropes which last for 2 hours each ...
-5
votes
1answer
218 views

Two ropes and 45 mins [duplicate]

You have got two ropes of same mass, same material, same thickness and same length but mass is not uniformly distributed over the length. Both of the ropes burn in 1 hour but you cannot cut them in ...
0
votes
2answers
178 views

I need to measure exactly half an hour [duplicate]

I only have two candles, each candle burns for exactly one hour. I do not know the length of the candle. Guessing and estimation is not allowed. You are not allowed any other materials other than the ...
-3
votes
2answers
186 views

Burning two fuses of variable length [duplicate]

This is an alteration (not a duplicate) of either the "Two Fuses burn for 45 minutes" or Burning ropes as timers questions. The fuses in my question are not identical and the answer(s) to the other ...
0
votes
3answers
40k views

Candle timing measurement [duplicate]

You are given two candles of equal size, which can burn 1 hour each. You have to measure 90 minutes with these candles. (There is no scale or clock). You are also given a lighter.
12
votes
1answer
3k views

Burning ropes as timers - How many time intervals can be measured?

Note: This is a follow-up question to Burning ropes as timers. The following question and its answers may contain spoilers. To sum up the puzzle, these are the rules (slightly modified): You have ...
10
votes
4answers
734 views

How to rephrase this puzzle about a meditating monk and incense

Here's a math-flavored puzzle I found on Andrej Cherkaev's website that I like to give to my undergraduate math students. I've paraphrased it to try to make it clearer: A monk was instructed by his ...
-3
votes
1answer
377 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 ...
5
votes
1answer
392 views

A “Puzzling” Cipher

I thought I'd put together a simple cipher for all of you Puzzling lovers out there. If you need help, you can always look to the wisdom of the past for guidance. The answer is a single word, and each ...