Posted by Lucy on Saturday, March 8, 2008 at 7:29pm.
Thomas can do a job 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 it they work together?

Algebra II  Ms. Sue, Saturday, March 8, 2008 at 7:40pm
With two of them working together, then their times will be cut in half. Thomas can do it in 2 hours, while Julia does it in 3 hours.
(2 + 3)/ 2 = 2 1/2 hours

Algebra II  drwls, Saturday, March 8, 2008 at 7:51pm
Not quite.
Their combined rate of doing the rob is
1/4 job/h + 1/6 job/h = 5/12 job/h
5/12 job/h * T (hr) = 1 job
T = 12/5 = 2 2/5 hours
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