what is the formula for solving this problem?

a new photocopier works 3 times as fast as an old one. when the machines work together a university can produce all its staff manuals in 12 hours. find the time it would take each machine, working alone, to complete the job. Thank you Moon Rose!

Asked By: Sherree - 10/2/2009
Best Answer - Chosen by Asker
Let x be the time it takes the old photocopier and y be the time it takes for the new one. The new one works 3 times as fast as the old one, so x = 3y. When they work together, they can produce all the staff manuals in 12 hours, so 12/x + 12/y = 1. Solve by substitution... More
Answered By: MoonRose9 - 10/2/2009
Additional Answers (2)
Answered By: gottjess? - 10/2/2009
New photocopier = x... More
Answered By: Lisa A - 10/2/2009
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