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    Question

    A pipe can fill a tank in 10 hours, while another pipe

    can empty it in 15 hours. If both pipes are opened simultaneously, in how many hours will the tank be full?
    A 30 hrs Correct Answer Incorrect Answer
    B 49 hrs Correct Answer Incorrect Answer
    C 44 hrs Correct Answer Incorrect Answer
    D 25 hrs Correct Answer Incorrect Answer

    Solution

    ATQ, Filling pipe's rate = 1/10 Emptying pipe's rate = 1/15 Net filling rate = 1/10 - 1/15 = 1/30 The tank will be full in 30 hours.

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