SOLUTION: An office has an old copying machine and a new one. Working together, it takes both machines 4 hours to make all the copies of the annual financial report. Working alone, it takes

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Question 820484: An office has an old copying machine and a new one. Working together, it takes both machines 4 hours to make all the copies of the annual financial report. Working alone, it takes the old copying machine 6 hours longer than the new one to make all the copies of the report. How long would it take the new copying machine to make all the copies working alone?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
4/x+4/(x+6)=1
x=6