SOLUTION: If Mary can rake leaves in 6 hours and Joe can do it in 7 hours, how long will it take them to do the job together?

SOLUTION: If Mary can rake leaves in 6 hours and Joe can do it in 7 hours, how long will it take them to do the job together?

Algebra.Com

Question 305005: If Mary can rake leaves in 6 hours and Joe can do it in 7 hours, how long will it take them to do the job together?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x/6+x/7=1
7x+6x=42
13x=42
x=42/13
x=3 3/13 hours
check
(42/13)/6+(42/13)/7=1
7/13+6/13=1
13/13=1
ok

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