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    Question

    Two pipes M and N can fill a tank in 16 hours and 24

    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 6 hours. After how many hours did pipe N stop working?
    A 8 hours Correct Answer Incorrect Answer
    B 12 hours Correct Answer Incorrect Answer
    C 10 hours Correct Answer Incorrect Answer
    D 6 hours Correct Answer Incorrect Answer

    Solution

    Let pipe N stop working after x hours x/24 + (x+6)/16 = 1 x = 6 hours

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