tijuanabrister16 tijuanabrister16

18-11-2018
Mathematics

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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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wolf1728 wolf1728

18-11-2018

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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