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    Question

    Time taken by pipe 'A' to fill a tank is 45 minutes.

    When both pipes 'A' and 'B' are opened together, the tank gets filled in 18 minutes. Find the time taken by 'B' to fill the tank alone.
    A 15 minutes Correct Answer Incorrect Answer
    B 40 minutes Correct Answer Incorrect Answer
    C 30 minutes Correct Answer Incorrect Answer
    D 50 minutes Correct Answer Incorrect Answer

    Solution

    Let the capacity of the tank be 90 litres (LCM of 45 and 18).

    Efficiency of 'A' = (90/45) = 2 litres/minute

    Combined efficiency of 'A' and 'B' = (90/18) = 5 litres/minute

    Efficiency of 'B' = 5 - 2 = 3 litres/minute

    Therefore, required time = (90/3) = 30 minutes

    Hence, the answer is 30 minutes.Ā 

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