SOLUTION: Roger can complete a job in 5 hours and Alex can complete the same job in 10 hours. How many hours will it take both of them to complete the job if they work together?

Question 678489: Roger can complete a job in 5 hours and Alex can complete the same job in 10 hours. How many hours will it take both of them to complete the job if they work together?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Roger can complete a job in 5 hours and Alex can complete the same job in 10 hours.
How many hours will it take both of them to complete the job if they work together?
:
Let t = time working together
Let the completed job = 1
;
+ = 1
2t + t = 10
;
3t = 10
;
t = 10/3
;
t = 3 hrs

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