Burning Rope Problem

Each rope will take exactly 1 hour to burn all the way through.
Burning rope problem. If we ignite a rope at one end then it takes exactly one hour to completely burn. At this point burn the rope 2 at the remaining end and it will burn off completely in 15 mins. This will burn the remaining rope in 15 minutes totaling the burning time to 45 minutes. First lit rope 1 in both ends and one end of rope 2.
Also the rope does not burn uniformly means one half of the rope may burn in let s say 10 mins while other half may take remaining 50 mins to burn. Posted by jason kottke nov 22 2006. How can he measure 45 mins using only these two ropes. You have two ropes coated in an oil to help them burn.
For an average sized person jumping rope might even burn more than 10 calories a minute. But either rope has different densities at different points so there s no guarantee of consistency in the time it takes different sections within the rope to burn. By the time rope one burns it will be 30 mins. He can t cut the one rope in half because the.
We have two ropes and a lighter with us. However the ropes do not burn at constant rates there are spots. Rope burning logic problem. A man has two ropes of varying thickness those two ropes are not identical they aren t the same density nor the same length nor the same width.
I d seen some of these problems before and i didn t have the time to work through the unfamiliar ones but my favorite was the very first question. Lit the other end of rope 2. Last week abbas raza of 3 quarks daily posed a list of logic problems to the site s readers. He actually wants to measure 45 mins.
The warming sun the cooling rain the snowflake drifting on the breath of the breeze the lightning bolt that frees the sky for you yet only eagles seem to. First rope second 30 mins second rope 15 mins 45 mins. Jumping rope can be a part of a diet and. Let s first see the problem statement.
Each rope burns in 60 minutes. But jumping rope alone won t be enough to help you lose weight. There are two ropes each rope takes 1 hour to burn. Interview questions by jobs.