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    Question

    A can complete a job in 20 hours. B alone can complete

    the same job in 15 hrs. A work for 9 hrs and then the remaining job is completed by B. How many hours will B be alone take to complete the remaining job?
    A 8 *1/4 hrs Correct Answer Incorrect Answer
    B 6 *2/7 hrs Correct Answer Incorrect Answer
    C 5 *1/9 hrs Correct Answer Incorrect Answer
    D 9 *5/6 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    The part of job that A completes in 9 hours = 9/20 Remaining job =1 - 9/20 = 11/20 Remaining job can be done by B in 11/20*15 = 33/4 = 8*1/4hrs

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