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16 February, 02:54

four men working together can create a trench in 42 days. they begin the job but one man works only half days. How long will it take to complete the trench?

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  1. 16 February, 03:02
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    48 days

    Step-by-step explanation:

    Four men working together can create a trench in 42 days.

    Find the number of man-days to complete the job

    4*42 = 168 man-days

    They begin, but one man works only half-days.

    How long will it take to complete the job?

    Let d = no. days to complete the trench

    d (3 + 0.5) = 168

    d (3.5) = 168

    3.5d = 168

    d = 168/3.5

    d = 48 days
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