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    Question

    A and B can complete a work in 12 days and 15 days

    respectively. If they work together for 4 days and then B leaves, in how many days can A complete the remaining work?
    A 2.4 days Correct Answer Incorrect Answer
    B 1.8 days Correct Answer Incorrect Answer
    C 4.8 days Correct Answer Incorrect Answer
    D 3.8 days Correct Answer Incorrect Answer

    Solution

    ATQ, A's daily work = 1/12 B's daily work = 1/15 A and B together do 1/12 + 1/15 = 3/20 of the work in one day. In 4 days, they complete 4 × (3/20) = 3/5 of the work. Remaining work = [1 - (3/5)] = 2/5 A will complete the remaining work in (2/5) / (1/12) = 24/5 = 4.8 days.

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