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    A tank can be filled in 9 hours. Because of a leak, it takes 10 hours to fill. In how much time will the leak alone empty the full tank?
    Question

    A tank can be filled in 9 hours. Because of a leak, it takes 10 hours to fill. In how much time will the leak alone empty the full tank?

    A.

    80 hours

    B.

    75 hours

    C.

    90 hours

    D.

    60 hours

    Correct option is C



    then efficiency of hole (Leakage) = 9 – 10 = (-1)
    Therefore the leak alone empty the full tank in 90/1 = 90 hours

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