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    Question

    Pipe C can fill a tank in 10 hours and pipe D in 15 hours.

    If both the pipes are opened in an empty tank, how much time will they take to fill it?
    A 18 hours Correct Answer Incorrect Answer
    B 6 hours Correct Answer Incorrect Answer
    C 14 hours Correct Answer Incorrect Answer
    D 10 hours Correct Answer Incorrect Answer

    Solution

    Let the capacity of tank be 30 litres (LCM of 10 and 15)Efficiency of 'C' = (30/10) = 3 litres/hourEfficiency of 'D' = (30/15) = 2 litres/hourRequired time = 30 ├╖ (3 + 2) = 6 hours

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