Multiple Choice Questions on A is thrice as efficient as B and hence completes a work in 40 days less than the number of days tak........... for CDS Exam Preparation

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Multiple Choice Questions

A is thrice as efficient as B and hence completes a work in 40 days less than the number of days tak...........

Quantitative Aptitude (CDS) Time and work
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    A is thrice as efficient as B and hence completes a work in 40 days less than the number of days taken by B. What will be the number of days taken

    by both of them when working together?

    22.5 days

    Incorrect Answer

    15 days

    Correct Answer

     20 days

    Incorrect Answer

    18 days

    Incorrect Answer
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    Explanation:

    Let efficiency of B is x

    Days are inversely proportional to efficiency.
    According to question,
    ⇒ 3X – X = 40 ⇒ X = 20
    Time taken by A = x days = 20 days
    Time taken by B = 3x days = 3 × 20 = 60 days
    Time taken by A and B together =
    20×60/80= 15 days

    By: Munesh Kumari
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