SOLUTION: sue can rake the leaves by herself in 4 hours while it takes sam 5 hours to rake the leave by himself. how long would it take them to rake the leaves if they worked together

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Question 989061: sue can rake the leaves by herself in 4 hours while it takes sam 5 hours to rake the leave by himself. how long would it take them to rake the leaves if they worked together
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
Sue does 1%2F4 of the job in one hour.
Sam does 1%2F5 of the job in one hour.
Working together, Sue and Sam would do
1%2F4%2B1%2F5=5%2F20%2B4%2F20=9%2F20 of the job in one hour.
At that rate, they would finish the job in
1%2F%28%289%2F20%29%29hours=20%2F9hours=2%262%2F9hours .