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OpenStudy (anonymous):

sue, an experienced shipping clerk, can fill a certain order in 4 hours. Felipse, a new clerk needs 7 hours to do the same job. working together, how long will it take them to fill the order.

OpenStudy (anonymous):

1hour sue does 1/4 of the work 1hour felipse does 1/7 of the work 1 hour they do:11/28 thus they can do everything in 28/11 hours or 2 hours 32 minutes

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