Cook the egg for 15 minutes

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You are trying to cook an egg for exactly fifteen minutes, but instead of a timer, you are given two ropes which burn for exactly 1 hour each. The ropes,are of equal densities. How can you cook the egg for exactly fifteen minutes?

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    We can follow these steps.
    Steps to measure 15 minutes

    1. Light Rope #1 from both ends.
    2. At the same time light Rope #2 from one end.
    3. When Rope #1 burns fully, it will be 30 minutes and Rope #2 will take 30 more minutes to burn, light the other end of Rope #2 at this time, thus it will take 15 minutes to burn.
    4. Start cooking your egg at the same point.
    5. Stop cooking when Rope #2 burns fully.
    ronret45 Expert Answered on 29th July 2015.
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    You don’t even need two ropes.
    Just have one rope.
    Fold it into half.
    And Light it from both the ends simultaneously!
    It will take fifteen minutes for the rope to burn.

    Vinayak Scholar Answered on 19th November 2015.
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