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    Question

    A pipe can fill a tank in 6 hours, another can empty it

    in 9 hours. How long to fill if both work together?
    A 12 hrs Correct Answer Incorrect Answer
    B 18 hrs Correct Answer Incorrect Answer
    C 10 hrs Correct Answer Incorrect Answer
    D 20 hrs Correct Answer Incorrect Answer

    Solution

    ATQ, Net rate = 1/6 - 1/9 = (3-2)/18 = 1/18 So, 18 hours

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