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Lisa can shovel snow from her driveway in 50 min. Jim an do the same job in 55 min.How long would it take Lisa and Jim if they worked together?
16 years ago

Answers

Reiny
lisa's rate = drive/50
Jim's rate = drive/55
combined rate = drive/50 + drive/55
= 21drive/550

so time = drive/(21drive/550) = 26 minutes
16 years ago

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