It takes bill 4 hours to do a job. it takes jane 2 hours to do the same job. how many such jobs could they do together in 4 hours.
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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.
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4/3 hr is the time it takes to do the job.
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