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    Question

    Pipe X can fill a pool in 18 hours and pipe Y in 36 hours.

    If both the pipes are opened in an empty pool, how much time will they take to fill it?
    A 10 hours Correct Answer Incorrect Answer
    B 12 hours Correct Answer Incorrect Answer
    C 15 hours Correct Answer Incorrect Answer
    D 18 hours Correct Answer Incorrect Answer

    Solution

    Let the capacity of tank be 36 litres (LCM of 18 and 36)Efficiency of 'X' = (36/18) = 2 litres/hourEfficiency of 'Y' = (36/36) = 1 litres/hourRequired time = 36 ÷ (2 + 1) = 12 hours

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