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How can you time 45 minutes with 2 sticks that each burn for one hour?
It will take exactly half the original time, i.e. 30 minutes to burn completely.
- 0 minutes – Light stick 1 on both sides and stick 2 on one side.
- 30 minutes – Stick 1 will be burnt out. Light the other end of stick 2.
- 45 minutes – Stick 2 will be burnt out. Thus 45 minutes is completely measured.
How would you get 30 minutes if you know that a rope takes 1 hour to burn and there are two ropes but they burn non linearly?
Update: Alright, here’s the answer. Light both ends of rope A and one end of rope B. After 30 minutes, rope A will be completely burned up and there will be 30 minutes of rope B left. Light the other end of rope B; it will burn up in 15 minutes.
How do you measure time with rope?
Two burning ropes riddle is little tricky but simple. Take one rope and burn it at both ends. At the same time, burn one end of the other rope. When it burns out, that`s 45 minutes.
Does fire burn rope?
The rope might burn slightly faster or slower in that last 25 percent. However, if you light one of the ropes on fire at both ends at the same time, it will burn up in 30 minutes, even if one side burns faster than the other. Once the second rope has been consumed by the flames, exactly 45 minutes have passed.
How long is a rope?
The Thai sen of 20 Thai fathoms or 40 m also means and is translated “rope”. The Somerset rope was a former English unit used in drainage and hedging. It was 20 feet (now precisely 6.096 m).
How long does it take to burn two ropes of varying thickness?
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 do you calculate the total time to climb a rope?
So the total time can be calculated like below. First rope + Second 30 mins + Second rope 15 mins = 45 mins. Nope as already said in the question the ropes aren’t homogenous through out niether do they have the same density across their lengths so this strategy won’t work.
Why can’t he cut the rope in half?
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. He will burn one of the rope at both the ends and the second rope at one end.