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  1. #1
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    Post Puzzle #451 - Timing with ropes

    Puzzle #451 - Timing with ropes


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  2. #2
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    Post Puzzle #451 - Timing with ropes

    1. Lit the first rope on both sides, it will burn in 1 hour.
    2. As soon as the first rope burns completely , lit the 2nd rope on both ends and at the centre, it will burn in 30 mins.
    3. Thus, measuring 1.5 hrs.

  3. #3
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    Post Puzzle #451 - Timing with ropes

    Quote Originally Posted by gauravalva View Post
    1. Lit the first rope on both sides, it will burn in 1 hour.
    2. As soon as the first rope burns completely , lit the 2nd rope on both ends and at the centre, it will burn in 30 mins.
    3. Thus, measuring 1.5 hrs.
    But how do you know that the left side of the 2nd rope won't burn in 10 minutes? After all, the rope is not homogenous.
    You can measure 1 hour by lighting the rope at both ends, but for measuring 1/2 hour, you need all 4 flames to meet at the exact same time. No guarantees there.

  4. #4
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    Post Puzzle #451 - Timing with ropes

    Fold (not cut) 1st rope in half and burn. When it completes burning it'll give 1 hour

    Fold the 2nd rope twice to give 1/4th of original length and then burn. When it finishes, it'll give 30 mins.[

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