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      Question

      Tap A and Tap B fill a drum of volume 357 liters in 17

      minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 35.7 minutes. Find x-y.
      A 7 Correct Answer Incorrect Answer
      B 4 Correct Answer Incorrect Answer
      C 3 Correct Answer Incorrect Answer
      D 1 Correct Answer Incorrect Answer

      Solution

                             A+B         B Time                 17     :   35.7 Efficiency        35.7   :    17                          21    :    10 Efficiency of A+B = 21 Efficiency of B = 10 Efficiency of A = 21 – 10 = 11 Ratio = x:y = 11:10 So, x – y = 11 – 10 = 1

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