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    Question

    Pipe A can fill a tank in 12 hours. Pipe B can empty the

    same full tank in 18 hours. If both pipes are opened together when the tank is empty, in how many hours will the tank be full?
    A 17 hrs Correct Answer Incorrect Answer
    B 42 hrs Correct Answer Incorrect Answer
    C 25 hrs Correct Answer Incorrect Answer
    D 36 hrs Correct Answer Incorrect Answer

    Solution

    ATQ, Let capacity = 36 units (LCM of 12 and 18). A’s filling rate = 36/12 = 3 units/hour B’s emptying rate = 36/18 = 2 units/hour Net rate = 3 − 2 = 1 unit/hour Time = 36 / 1 = 36 hours

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