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    Question

    Pipe A can fill a tank in 12 hours and pipe B in 18 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 7.2 hours Correct Answer Incorrect Answer
    C 8 hours Correct Answer Incorrect Answer
    D 14 hours Correct Answer Incorrect Answer

    Solution

    Let the capacity of tank be 36 litres (LCM of 12 and 18)Efficiency of 'A' = (36/12) = 3 litres/hourEfficiency of 'B' = (36/18) = 2 litres/hourRequired time = 36 ÷ (3 + 2) = 7.2 hours

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