Multiple Choice Questions on An alone can do work in 60 days A and B can do the same work in 40days In how many days B can do thi........... for CDS Exam Preparation

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Multiple Choice Questions

An alone can do work in 60 days A and B can do the same work in 40days In how many days B can do thi...........

Quantitative Aptitude (CDS) Time and work
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    An alone can do work in 60 days. A and B can do the same work in 40days. In how many days B can do this work alone?

    120days

    Correct Answer

    100days

    Incorrect Answer

    150days

    Incorrect Answer

    140days

    Incorrect Answer
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    Explanation:

    A -> 60  = 2×2×3×5
    B -> 40  = 2×2×2×5
    = 2×3×5×2×2×5 = 600 unit (total work)
    A -> 10 unit work per day
    A + B = 15 unit work per day
    B = 15- 10 = 5 unit work per day
    B alone = 600/5 = 120days

    By: bhavesh kumar singh
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