Burning Rope Timer Puzzle

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Burning Rope Timer Puzzle

 

Burning Rope Timer Puzzle

 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). Each rope burns in 60 minutes. He actually wants to measure 45 mins. How can he measure 45 mins using only these two ropes.
He can’t cut the one rope in half because the ropes are non-homogeneous and he can’t be sure how long it will burn.

Before looking at the answer We Strongly advised you to think about the solution and take out the answer and then match your answer with ours.

Answer:

 Ignite one of the rope from both the ends and the other rope from one end.

1st rope(Ignited from both ends) takes 30 min to burn completely

2nd rope(Ignited from one of end) - in 30 min burns till half.

NOW half of the 2nd rope is left, and it is ignited from other end and to burn completely it takes 15 min.

Total Time taken to burn both the ropes is 30+15 =45 min.