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8 February, 08:28

Working alone, it would take Sandra 45 minutes to now the lawn. TO mow the same lawn, also working alone, it would take kelly 1 hour and 15 minutes. if they work together, the girls believe it will take them 1 hour to mow the lawn

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  1. 8 February, 10:53
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    No. You don't take the average. The formula is:

    (worker 1 * worker 2) / (worker 1 + worker 2)

    (45 * 75) / (45 + 75) =

    3,375 / 120 = 28.125 minutes total time
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Home » Mathematics » Working alone, it would take Sandra 45 minutes to now the lawn. TO mow the same lawn, also working alone, it would take kelly 1 hour and 15 minutes. if they work together, the girls believe it will take them 1 hour to mow the lawn
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