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 - Chapter 7 Test - Page 323: 25

Answer

12 minutes.

Work Step by Step

Alex mows 1/30 = .0333 lawns per minute, and Garth mows 1/20 = .05 lawns per minute. Thus, we obtain: $1 = .0333t + .05 t \\ .0833t = 1 \\ t =12 $

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