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      Question

      A tank is filled by three pipes A, B, and C. Pipe A can

      fill the tank in 12 hours, pipe B in 16 hours, and pipe C can empty the tank in 8 hours. If all three pipes are opened together, how long will it take to fill the tank completely?
      A 48 hours Correct Answer Incorrect Answer
      B 32 hours Correct Answer Incorrect Answer
      C 24 hours Correct Answer Incorrect Answer
      D 20 hours Correct Answer Incorrect Answer

      Solution

      Net rate = 1/12 + 1/16 - 1/8  = (4 + 3 - 6)/48 = 1/48.  Time = 48 hours.  Correct option: a

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