SOLUTION: You can do a job in 12 minutes and your friend takes 15 minutes. How long will it take both of you to complete the job working together?

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Question 444935: You can do a job in 12 minutes and your friend takes 15 minutes. How long will it take both of you to complete the job working together?
Answer by rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
x/12+x/15=1
20x/12+20x/15=20
5x/3+4x/3=20
9x=60
x=60/9
x=20/3
x= 6 2/3 minutes