Algebra
posted by BK .
Thomas can do a job in 4 hours. Julia can do the same job in7 hours. How many hours will it take the two of them to do the job it they work together?

Algebra 
drwls
1/4 + 1/7 = 1/x
Solve for x, the number of hours.
1/x = 11/28
x = 28/11 = 2 6/11 hours
= 2 hours 33 minutes.
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