Multiple Choice Questions on P and Q together can complete a job in 90days Q and R takes 60 days to complete the same work and P ........... for SSC (MTS) Preparation

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Multiple Choice Questions

P and Q together can complete a job in 90days Q and R takes 60 days to complete the same work and P ...........

Quantitative Aptitude (MTS) Time and work
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    P and Q together can complete a job in 90days, Q and R takes 60 days to complete the same work and P and R will take 45 days to complete the same work. How much time will P, Q and R will take to complete the work together.

    40 days

    Correct Answer

    42 days

    Incorrect Answer

    36 days

    Incorrect Answer

    44 days

    Incorrect Answer
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    Explanation:

    ( 1/90 + 1/60 + 1/45)*1/2 = (1/P +1/Q + 1/R) = 1/40
    so 40 days

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