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      Question

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

      fill the tank in (x – 4) hours. If the efficiency of pipe B is double of pipe A and pipe A fill the tank is 45 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 45 liters per hour, so Pipe B alone fill 90 liters per hour. Capacity of the tank = T => T/45 – T/90 = x – (x – 4) => 2T – T = 360 => T = 360 liters

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