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    Question

    A can complete a work in 15 days. B takes 6 days less

    than A to complete the same work. In how many days can both of them together complete 80% of the work together?
    A 8 days Correct Answer Incorrect Answer
    B 3 days Correct Answer Incorrect Answer
    C 10 days Correct Answer Incorrect Answer
    D 4.5 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Time taken by B to complete the work = 15 – 6 = 9 days Let the total work = 45 units Efficiency of A = 45/15 = 3 units/day Efficiency of B = 45/9 = 5 units/day Required time taken = 0.80 x 45/(3+5) = 4.5 days

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