SOLUTION: Fred can do a job in 4 hours. Bill can do the same job in 2 hours. How long will it take them working together?

SOLUTION: Fred can do a job in 4 hours. Bill can do the same job in 2 hours. How long will it take them working together?

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Question 877553: Fred can do a job in 4 hours. Bill can do the same job in 2 hours. How long will it take them working together?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Fred can do 1/4 the job in 1 hr.
Bill can do 1/2 the job in 1 hr.
1/2 + 1/4
=2/4 + 1/4
=3/4 the job in 1 hr together.
.
4/3 hr is the time it takes to do the job.
.
Ed
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