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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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