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    Question

    An inlet pipe can fill a tank in 12 hours, whereas an

    outlet pipe can empty the same tank in 18 hours. Find the time taken by four such inlet pipes and three such outlet pipes to fill the tank completely if all the pipes are opened together.
    A 6 hrs Correct Answer Incorrect Answer
    B 2 hrs Correct Answer Incorrect Answer
    C 5 hrs Correct Answer Incorrect Answer
    D 12 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let the total capacity of the tank be 36 units (LCM of 12 and 18). Required time = (36/(12-6)) = 36/6 = 6 hrs

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