Multiple Choice Questions on A can write 75pages in 25hrs A and B together can write 135pages in 27hrs In what time can B wr........... for Civil Services Exam (CSAT) Preparation

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Multiple Choice Questions

A can write 75pages in 25hrs A and B together can write 135pages in 27hrs In what time can B wr...........

Math and Mental Ability Time and work
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    A can write 75pages in 25hrs. A and B together can write 135pages in 27hrs.  In what time can B write 42pages?

    17

    Incorrect Answer

    19

    Incorrect Answer

    23

    Incorrect Answer

    21

    Correct Answer
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    Explanation:

    Solution:
    A can write 75/25 =3pages in 1hr
    A+B can  135/27 = 5pages in 1hr
    B can write 5-3 = 2page in 1hr
    42/2 =21hrs

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