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    Question

    A and B can finish a job in 10 and 15 days respectively.

    They start together, but after 2 days A leaves. How many more days will B take to complete the rest?
    A 10 days Correct Answer Incorrect Answer
    B 12 days Correct Answer Incorrect Answer
    C 18 days Correct Answer Incorrect Answer
    D 20 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Work done in 2 days = 2(1/10 + 1/15) = 2(1/6) = 1/3. Remaining = 2/3. B alone rate = 1/15 ⇒ time = (2/3)/(1/15) = 10 days.

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