Answer
4 minutes.
Work Step by Step
First, we find how many copies copier A made in the initial time:
copies $ = 40(6) = 240$
This means that there are 520-240=280 copies left to be made. Thus:
$280 = 40t + 30t \\ t = 4$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 7 - Algebraic Fractions - 7.6 - More Fractional Equations and Problem Solving - Problem Set 7.6 - Page 315: 47
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