Mathematics, 01.07.2019 07:30 sarah1911

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?

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One cooy machine can run off copies in 198 minutes. a newer machine can do the same job in 126 minut...

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