SOLUTION: if lisa can shovel her driveway in 45 minutes and tom can do it in 35 minutes how long will it take if they both did it.
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Question 348045: if lisa can shovel her driveway in 45 minutes and tom can do it in 35 minutes how long will it take if they both did it. Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! lisa 45 minute
so she can do 1/45 of job in 1 minute.
Tome - 35 minutes
so he can do 1/35 of the job in 1 minute
To gether they can do 1/45 + 1/35 of job in 1 minute.
35+45 / 35*45
80/1575
so they will take 1575/80 minutes to shovel together
19.7 minutes
