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    Question

    Pipe A can fill a tank in 20 hours and pipe B in 30 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 10 hours Correct Answer Incorrect Answer
    C 14 hours Correct Answer Incorrect Answer
    D 12 hours Correct Answer Incorrect Answer

    Solution

    Let the capacity of tank be 60 litres (LCM of 20 and 30)Efficiency of 'A' = (60/20) = 3 litres/hourEfficiency of 'B' = (60/30) = 2 litres/hourRequired time = 60 ÷ (3 + 2) = 12 hours

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