Posted by **Sha** on Monday, November 10, 2008 at 6:51pm.

Thomas in 4 hours. Julia can do the same job in 6 hours. How many hours will it take the two of them to do the job if they work together?

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**economyst**, Wednesday, November 12, 2008 at 9:02am
Assuming there is no change in productivity..

In one hour, Thomas does 1/4=25% of the job, while Julia does 1/6=16.66%. Combined they would do 25%+16.66% = 41.66% of the job in 1 hour. So, 1/.4166= 2.4 hours

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