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      Question

      Tap A and Tap B fill a drum of volume 494 liters in 19

      minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 49.4 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                 19     :   49.4 Efficiency        49.4   :    19                          26    :    10 Efficiency of A+B = 26 Efficiency of B = 10 Efficiency of A = 26 – 10 = 16 Ratio = x:y = 16:10 So, x – y = 16 – 10 = 6

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