Question
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?
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
Jim's rate = drive/55
combined rate = drive/50 + drive/55
= 21drive/550
so time = drive/(21drive/550) = 26 minutes