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    Question

    A alone can finish a piece of work in 10 days, and B

    alone can finish it in 15 days. In how many days can they finish it together?
    A 5 days Correct Answer Incorrect Answer
    B 6 days Correct Answer Incorrect Answer
    C 10 days Correct Answer Incorrect Answer
    D 21 days Correct Answer Incorrect Answer

    Solution

    ATQ, A’s 1-day work = 1/10 B’s 1-day work = 1/15 Together = 1/10 + 1/15 = (3 + 2)/30 = 5/30 = 1/6. So they take 6 days.

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