# Chapter 7 - Algebraic Fractions - 7.6 - More Fractional Equations and Problem Solving - Problem Set 7.6 - Page 315: 47

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: $280 = 40t + 30t \\ t = 4$

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