Copiers

The new copier is copying a folder of papers 5 minutes faster than the old one. The operator used a new one, but it was out of toner, and the exchange took 5 minutes at that time, copied on the old one. The whole work was done in 9 min. How long would the work be done only by the old copier?

Your answer:

min


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algebrabasic operations and conceptsUnits of physical quantitiesthemes, topicsGrade of the word problem

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