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      Question

      Pipe β€˜A’ can fill a tank in 20 hours while pipe

      β€˜B’ can empty it in 40 hours. They were operated on alternate hours starting with pipe β€˜A’. Find the percentage of tank filled this way in 28 hours.
      A 35% Correct Answer Incorrect Answer
      B 25% Correct Answer Incorrect Answer
      C 15% Correct Answer Incorrect Answer
      D 60% Correct Answer Incorrect Answer

      Solution

      Let the total capacity of tank be 40 units Efficiency of pipe β€˜A’ = 40/20 = 2 units/hour Efficiency of pipe β€˜B’ = 40/40 = 1 units/hour Tank filled in 2 hours = (2 – 1) = 1 units Therefore, tank filled in (2 Γ— 14 = 28 hours) = 1 Γ— 14 = 14 units Required percentage of tank filled = (14/40) Γ— 100 = 35%

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