#### 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 $

Published by
Cengage Learning

ISBN 10:
1285194055

ISBN 13:
978-1-28519-405-9

12 minutes.

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