SOLUTION: It takes Alex 10 hrs to clean an attic It takes Cody 7 hrs to clean the same attic Working together how long will it take them both to clean the same attic?

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Question 727275: It takes Alex 10 hrs to clean an attic
It takes Cody 7 hrs to clean the same attic
Working together how long will it take them both to clean the same attic?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x/10+x/7 =1
or
1/10+1/7=1/x