Question: 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
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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Lett represent the time it takes the older machine to complete the job by itself Old copier ... View full answer
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