Question

    A tank is normally filled in 4 hours. But it takes 5

    hours to fill, when there is a leak at the bottom of the tank.  If the tank is full, in how many hours can it be emptied by the leak?
    A 12 Correct Answer Incorrect Answer
    B 20 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 15 Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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