Linked Questions
13 questions linked to/from Burning ropes as timers
4
votes
3answers
229 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
180 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
247 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
285 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
181 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
213 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
47k 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.
6
votes
2answers
1k views
Three ropes and a lighter puzzle
You are given three ropes and a lighter. The time required to burn through rope $1$ with a single flame is $20$ minutes. The time required to burn through rope $2$ with a single flame is $30$ minutes. ...
10
votes
4answers
1k 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 ...
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 ...
-3
votes
1answer
568 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 ...
6
votes
2answers
477 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 ...
4
votes
1answer
352 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 ...