Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 6 - Rational Expressions and Equations - Test: Chapter 6 - Page 439: 20


12 minutes

Work Step by Step

We add the rates of the two machines to find their overall rate: $$ \frac{1}{20}+\frac{1}{30}\\ \frac{3}{60}+\frac{2}{60}\\ \frac{5}{60}\\ \frac{1}{12}$$ Thus, taking the reciprocal, it would take them 12 minutes to do it together.
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