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    Question

    Tap A and Tap B fill a drum of volume 425 liters in 17

    minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 42.5 minutes. Find x-y.
    A 7 Correct Answer Incorrect Answer
    B 4 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 6 Correct Answer Incorrect Answer
    E 5 Correct Answer Incorrect Answer

    Solution

                           A+B         B Time                 17     :   42.5 Efficiency        42.5   :    17                          25    :    10 Efficiency of A+B = 25 Efficiency of B = 10 Efficiency of A = 25 – 10 = 15 Ratio = x:y = 15:10 So, x – y = 15 – 10 = 5

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