Multiple Choice Questions on 39 A 39 can do a piece of work in 20 days and 39 B 39 can do the same work in 15 days How........... for Study NOtes Preparation

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Multiple Choice Questions

39 A 39 can do a piece of work in 20 days and 39 B 39 can do the same work in 15 days How...........

Quantitative Aptitiude (CLAT) Time and work
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    'A' can do a piece of work in 20 days and 'B' can do the same work in 15 days. How long will they take to finish the work, if both work together ?

    13 1/2 days

    Incorrect Answer

    10 days

    Incorrect Answer

    8 4/7 days

    Correct Answer

    17 1/2 days

    Incorrect Answer
    Explanation:

    A in 20 and B in 15,
    so, we get LCM = 60 Which is 20 × 3 and 15 × 4 by adding these two rates we get 3+4 = 7,
    and they both are able to do the work in 60 / 7 = 8 4/7 days
    Hence, option 3 is the correct answer.

    By: Amit Kumar
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