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5 votes
One cooy machine can run off copies in 198 minutes. A newer machine can do the same job in 126 minutes. How long does it take the two​ machines, working​ together, to make all of the necessary​ copies?

User Ksarmalkar
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1 Answer

6 votes
This depends on the necessary number of copies.
User Steve Robbins
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7.9k points
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