Multiple Choice Questions on A typing work is done by three person P Q and R P alone takes 20 hours to type a single booklet but ........... for NABARD Assistant Manager Exam Preparation

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Multiple Choice Questions

A typing work is done by three person P Q and R P alone takes 20 hours to type a single booklet but ...........

Quantitative Aptitude (Phase-1) Time and work
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    A typing work is done by three person P, Q and R. P alone takes 20 hours to type a single booklet but Q and R working together takes 5 hours, for the completion of the same booklet. If all of them worked together and completed 15 booklets, then how many hours have they worked?

    45hrs

    Incorrect Answer

    60hrs

    Correct Answer

    38hrs

    Incorrect Answer

    55hrs

    Incorrect Answer
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    Explanation:

    Solution: 
    1/P=1/20
    1/P+1/Q+1/R=1/20+1/5=1/4
    In 4 hours, working together, they will complete 1 booklets.
    Thus, 15 booklets completed in 60hrs.

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