SOLUTION: Martha can rake the leaves in her yard in 8 hours. Her brother can do the job in 2 hours. How long will it take them to do the job working together?

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Question 182136: Martha can rake the leaves in her yard in 8 hours. Her brother can do the job in 2 hours. How long will it take them to do the job working together?
Answer by tvandenberg(45) About Me  (Show Source):
You can put this solution on YOUR website!
A few ways to solve this, I'll try to use the way that makes the most sense to me.

In 8 hours, she can do one and he can do four. So, you could say in 8 hours they together can do 5 yards.

8 hours / 5 yards = 1.6 hrs / yard