A new copying machine can do a certain job in 1 hour less than an older copier.

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A new copying machine can do a certain job in 1 hour less than an older copier. Together they can do this job in 72 minutes. How long would it take the older copier by itself to do the job?

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College Algebra

ISBN: 9780135226865

11th Edition

Authors: Michael Sullivan, Michael Sullivan III

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