SOLUTION: new copy machine takes 20 mins to copy exams
old copy machine take 30 mins to copy exams
how long does it take if both copy machines are used?
Algebra.Com
Question 816422: new copy machine takes 20 mins to copy exams
old copy machine take 30 mins to copy exams
how long does it take if both copy machines are used?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x/20+x/30=1
3x/60+2x/60=1
5x/60=1
x/12=1
x=12 mins
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