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    Question

    A can complete a work in 12 days, and B can complete the

    same work in 18 days. How many days will they take to complete the work if they work together?
    A 6 days Correct Answer Incorrect Answer
    B 7.2 days Correct Answer Incorrect Answer
    C 9 days Correct Answer Incorrect Answer
    D 10.4 days Correct Answer Incorrect Answer
    E 8 days Correct Answer Incorrect Answer

    Solution

    A’s rate of work = 1/12 B’s rate of work = 1/18 Together, their rate of work = 1/12 + 1/18 = (3 + 2) / 36 = 5/36 So, the time taken to complete the work together = 36/5 = 7.2 days Correct option: b

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