SOLUTION: Martha can rake the leaves in her yard in 3 hours. Her brother can do the job in 5 hours. How long will it take them to do the job working together?

SOLUTION: Martha can rake the leaves in her yard in 3 hours. Her brother can do the job in 5 hours. How long will it take them to do the job working together?

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Question 977322: Martha can rake the leaves in her yard in 3 hours. Her brother can do the job in 5 hours. How long will it take them to do the job working together?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

If A can do a job in x time periods, then A can do

of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do

of the job in 1 time period.

So, working together, they can do

of the job in 1 time period.

Therefore, they can do the whole job in:

time periods.

John

My calculator said it, I believe it, that settles it

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