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      Question

      A pipe fills a tank in 10 hours. A leak empties it in 15

      hours. If both are open, how long to fill the tank?
      A 30 hrs Correct Answer Incorrect Answer
      B 20 hrs Correct Answer Incorrect Answer
      C 40 hrs Correct Answer Incorrect Answer
      D 10 hrs Correct Answer Incorrect Answer

      Solution

      ATQ, Net rate = 1/10 − 1/15 = (3−2)/30 = 1/30 Time = 30 hours

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