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    Question

    Pipe D can fill a pool in 6 hours and pipe E in 12 hours.

    If both the pipes are opened in an empty pool, how much time will they take to fill it?
    A 2 hours Correct Answer Incorrect Answer
    B 4 hours Correct Answer Incorrect Answer
    C 6 hours Correct Answer Incorrect Answer
    D 8 hours Correct Answer Incorrect Answer

    Solution

    Let the capacity of tank be 12 litres (LCM of 6 and 12)
    Efficiency of 'D' = (12/6) = 2 litres/hour
    Efficiency of 'E' = (12/12) = 1 litres/hour
    Required time = 12 ÷ (2 + 1) = 4 hours

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