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14 December, 01:41

The time required to do a job varies inversely as the number of people working. It takes 5hr for 7 bricklayers to build a park well. How long will it take 10 bricklayers to complete the job? (round answer to 1 decimal place)

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  1. 14 December, 01:51
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    Answer

    3.5 hours.

    Explanation

    The first step is to calculate the constant of proportionality.

    t ∝ 1/n

    t = k/n Where t = time, K = constant and n = number of people

    t = k/n

    k = tn

    = 5*7 = 35

    The equation becomes;

    t = 35/n

    for n = 10,

    t = 35/10

    t = 3.5 hours.
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