SOLUTION: Marisa can shovel snow from her driveway in 40 min. Jim can do the same job in 30 min. How long would it take both to shovel the driveway together.

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Question 678372: Marisa can shovel snow from her driveway in 40 min. Jim can do the same job in 30 min. How long would it take both to shovel the driveway together.
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
1/40+1/30=1/x
(30+40)/30*40=1/x
70/1200=1/x
70x=1200
x=1200/70
x=17.14 hours.