SOLUTION: Bert can clean the sidewalks around the building in 2hours by using blower.Dennis can do the same job in 8 hours using a broom.how long it take them working together.
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Question 1111625: Bert can clean the sidewalks around the building in 2hours by using blower.Dennis can do the same job in 8 hours using a broom.how long it take them working together. Answer by ikleyn(52802) (Show Source):
Bert makes of the job per hour. It is his rate of work.
Dennis makes of the job per hour. It is his rate of work.
Working together, they make + of the job per hour.
When they work together, their rates are summing up !
+ = + = .
So, working together, they do of the job per hour.
Hence, it will take them hours = 8*12 minutes = 96 minutes = 1 hour and 36 minutes to complete the job working together.
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It is a typical joint work problem.
