# college algebra

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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?

• college algebra -

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

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