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      Question

      Two pipes M and N can fill a tank in 10 hours and 15

      hours respectively. The pipes were opened together, but pipe N stopped working after sometime and the rest of the tank was filled by pipe M in 5 hours. After how many hours did pipe N stop working?
      A 2 hours Correct Answer Incorrect Answer
      B 3 hours Correct Answer Incorrect Answer
      C 4 hours Correct Answer Incorrect Answer
      D 5 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let pipe N stop working after x hours x/15 + (x+5)/10 = 1 x = 3 hours

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