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      Question

      Pipe A alone fill the tank in x hours and Pipe B alone

      fill the tank in (x – 6) hours. If the efficiency of pipe B is double of pipe A and pipe A fill the tank is 40 liters per hour, then what is the capacity of the tank?
      A 480 liters Correct Answer Incorrect Answer
      B 360 liters Correct Answer Incorrect Answer
      C 525 liters Correct Answer Incorrect Answer
      D 300 liters Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Pipe A alone fill 40 liters per hour, so Pipe B alone fill 80 liters per hour. Capacity of the tank = T => T/40 – T/80 = x – (x – 6) => 2T – T = 480 => T = 480 liters

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