Elementary Algebra

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: 42

Answer

6 minutes

Work Step by Step

Doug is working at 1/15 = .067 jobs per minute while Betty is working at 1/10=.1 jobs per minute. Thus: $ 1 = .067t + .1t \\ 1 = .167t \\ t =6$
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