Multiple Choice Questions on A can do a piece of work in 12 days B can do this work in 16 days A started the work alone After how........... for CDS Exam Preparation

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Multiple Choice Questions

A can do a piece of work in 12 days B can do this work in 16 days A started the work alone After how...........

Quantitative Aptitude (CDS) Time and work
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    A can do a piece of work in 12 days. B can do this work in 16 days. A started the work alone. After how many days should B join him, so that the work is finished in 9 days?

    3

    Incorrect Answer

    6

    Incorrect Answer

    1

    Incorrect Answer

    5

    Correct Answer
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    Explanation:

    A's work in 9 days = 9/12 = 3/4. Remaining work = 1/4.
    This work was done by B in 1/4 × 16 = 4 days.
    ∴ B would have joined A after 9 – 4 = 5 days.

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