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      Question

      Pipe A and B can fill the pool in 25 minutes and 50

      minutes, respectively. Pipe C can empty half filled pool in 25 minutes. If all the pipes are opened together, then find the time taken to fill the empty pool completely.
      A 32 minutes Correct Answer Incorrect Answer
      B 33 minutes Correct Answer Incorrect Answer
      C 35 minutes Correct Answer Incorrect Answer
      D 25 minutes Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Time is taken by pipe C to empty the full pool = 25 ร— 2 = 50 minutes Let the capacity of the pool = 50 units Number of units of water filled by pipe A alone in one minute = 50/25 = 2 units Number of units of water filled by pipe B alone in one minute = 50/50 = 1 units Number of units of water emptied by pipe C alone in one minute = 50/50 = 1 units Required time taken = 50/(2 + 1 โ€“ 1) = 25 minutes

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