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    Question

    Pipe A can fill a tank in 12 hours, and Pipe B can fill

    it in 15 hours. Pipe C can empty the full tank in 20 hours. If all three pipes are opened together, how much time will it take to fill the tank?
    A 10 hrs Correct Answer Incorrect Answer
    B 12 hrs Correct Answer Incorrect Answer
    C 18 hrs Correct Answer Incorrect Answer
    D 22 hrs Correct Answer Incorrect Answer

    Solution

    ATQ, CM(12, 15, 20) = 60. Efficiencies: A(+5), B(+4), C(-3). Net Eff = 6. Time = 60/6 = 10 hours.

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