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    Question

    Tap A and Tap B fill a drum of volume 408 liters in 12

    minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 40.8 minutes. Find x-y.
    A 17 Correct Answer Incorrect Answer
    B 14 Correct Answer Incorrect Answer
    C 19 Correct Answer Incorrect Answer
    D 11 Correct Answer Incorrect Answer

    Solution

                           A+B         B Time                 12     :   40.8 Efficiency        40.8   :    12                          34    :    10 Efficiency of A+B = 34 Efficiency of B = 10 Efficiency of A = 34 – 10 = 24 Ratio = x:y = 24:10 So, x – y = 24 – 10 = 14

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