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      Question

      Pipe A and Pipe B together can fill the tank in 15

      hours. The capacity of the pipe A is 20% of the capacity of the pipe B. How much time will pipe B alone take to fill the tank.
      A 18 hours Correct Answer Incorrect Answer
      B 25 hours Correct Answer Incorrect Answer
      C 13 hours Correct Answer Incorrect Answer
      D 30 hours Correct Answer Incorrect Answer

      Solution

      Capacity of the pipe A = 20/100 × Pipe B Pipe A /Pipe B = 1/5 Efficiency of pipe A = 1 units Efficiency of pipe B = 5 units Total work = 15 × (1+5) = 90 units Time taken by Pipe B to fill the tank = 90/5 = 18 hours

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