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 $
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
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