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    Question

    A pipe can fill a tank in 36 minutes while another pipe can

    drain the full tank in 48 minutes. Calculate how much time both pipes working together will take to fill one-third of the tank.
    A 48 mins Correct Answer Incorrect Answer
    B 35 mins Correct Answer Incorrect Answer
    C 22 mins Correct Answer Incorrect Answer
    D 12 mins Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ;
    Let the total capacity of the tank be 144 litres (LCM of 36 and 48)

    Efficiency of filling pipe = (144 / 36) = 4 litres/minute

    Efficiency of draining pipe = (144 / 48) = -3 litres/minute

    Required time = (1/3 × 144) ÷ (4 - 3) = 48 minutes

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