Question
Solve each problem.A copier can do a large printing job in $20 \mathrm{hr}$. An older model can do the same job in $30 \mathrm{hr}$. How long would it take to do the job using both copiers?
Step 1
Step 1: Let's denote the rate of work of the first copier as $1/20$ job per hour and the rate of work of the second copier as $1/30$ job per hour. Show more…
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