college algebra
posted by karen .
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
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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