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9 July, 21:03

If an experienced surveyor can survey a roadbed in 7 hours and an apprentice surveyor needs 10 hours, how long will it take them to complete the job together

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  1. 10 July, 00:09
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    Experienced: I hour, 1/7 done

    apprentice: 1 hour, 1/10 done

    together: 1 hour, 10/70 + 7/70 = 17/70 done

    Therefore ...

    1 / 17/70 = 4.1176 hours (70/17 hours)
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