SOLUTION: It takes Paul 4 hours to do a job. It takes Peter 2 hours to do that same job. How many such jobs could they do together in 4 hours?

Question 614391: It takes Paul 4 hours to do a job. It takes Peter 2 hours to do that same job. How many such jobs could they do together in 4 hours?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
It takes Paul 4 hours to do a job.
It takes Peter 2 hours to do that same job.
How many such jobs could they do together in 4 hours?
:
Let t = time when both of them to do one job
Let one completed job = 1
:
+ = 1
multiply by 4
t + 2t = 4
3t = 4
t = hr for both of them to do one job
:
Find how many jobs they could do in 4 hrs
4 divided by
invert the dividing fraction and multiply
4 * = 3 jobs in 4 hrs
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