Mathematics, 02.04.2020 02:38 mbrisen3396

A new photocopier works 4 times as fast as an old one. When the machines work together, a university can produce all its staff manuals in 20 hr. Find the time it would take each machine, working alone, to complete the job.

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A new photocopier works 4 times as fast as an old one. When the machines work together, a university...

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