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      Question

      A pipe can fill a tank in 12 hours, while a leak can

      empty it in 18 hours. In how many hours will the tank be filled if both are open together?
      A 18 hrs Correct Answer Incorrect Answer
      B 28 hrs Correct Answer Incorrect Answer
      C 36 hrs Correct Answer Incorrect Answer
      D 20 hrs Correct Answer Incorrect Answer

      Solution

      Filling rate = 1/12 tank per hour Emptying rate = 1/18 tank per hour Net rate = 1/12 - 1/18 = (3 - 2)/36 = 1/36 So, time = 36 hours

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