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    Question

    Pipe X can fill a tank in 15 hours and pipe Y in 30

    hours. If both the pipes are opened in an empty tank, how much time will they take to fill it?
    A 10 hours Correct Answer Incorrect Answer
    B 18 hours Correct Answer Incorrect Answer
    C 14 hours Correct Answer Incorrect Answer
    D 16 hours Correct Answer Incorrect Answer

    Solution

    Let the capacity of tank be 30 litres (LCM of 15 and 30)Efficiency of 'X' = (30/15) = 2 litres/hourEfficiency of 'Y' = (30/30) = 1 litres/hourRequired time = 30 ÷ (2 + 1) = 10 hours

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