SOLUTION: Martha can rake the leaves in her yard in two hours. Her brother can rake the leaves in six hours. How long will it take if they work together?
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-> SOLUTION: Martha can rake the leaves in her yard in two hours. Her brother can rake the leaves in six hours. How long will it take if they work together?
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Question 1109813: Martha can rake the leaves in her yard in two hours. Her brother can rake the leaves in six hours. How long will it take if they work together? Answer by ikleyn(52887) (Show Source):
Martha does of the job per hour. It is her rate of work.
Brother does of the job per hour. It is his rate of work.
Working together, they do + of the work per hour.
+ = + = = .
So, working together they make of the job per hour.
It means that it will take hours for them to complete the job working together.
= hours = 1 hour and 30 minutes.
Answer. It will take hours = 1 hour and 30 minutes for them to complete the job working together.
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It is a typical joint work problem.
