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    Question

    Two pipes M and N can fill a tank in 20 hours and 30

    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 8 hours Correct Answer Incorrect Answer
    B 10 hours Correct Answer Incorrect Answer
    C 9 hours Correct Answer Incorrect Answer
    D 7 hours Correct Answer Incorrect Answer

    Solution

    Let pipe N stop working after x hours x/30 + (x + 5)/20 = 1 x = 9 hours

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