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$
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: 42
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