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      Question

      Two pipes P1 and P2 can fill a cistern in 12 minutes and

      15 minutes respectively. These pipes are opened alternately for 1 minute each, beginning with pipe P1. In what time will the cistern be full?
      A 13 min 20 seconds Correct Answer Incorrect Answer
      B 12 min 30 seconds Correct Answer Incorrect Answer
      C 10 min 20 seconds Correct Answer Incorrect Answer
      D 11 min 15 seconds Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

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