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      Question

      Tap A and Tap B fill a drum of volume 483 liters in 21

      minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 48.3 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

      Solution

                             A+B         B Time                 21     :   48.3 Efficiency        48.3   :    21                          23    :    10 Efficiency of A+B = 23 Efficiency of B = 10 Efficiency of A = 23 – 10 = 13 Ratio = x:y = 13:10 So, x – y = 13 – 10 = 3

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