Homework Help: college algebra

Posted by karen on Friday, November 21, 2008 at 6:02pm.

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 - Reiny, Friday, November 21, 2008 at 6:17pm
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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