Answer
$$ \frac{2}{3}\ \text{Lawns per hour}$$
Work Step by Step
We know that the overall rate is equal to the sum of the individual rates. Letting Mark's rate be $x$, we find:
$$ 1=\frac{1}{3}+x \\ x=\frac{2}{3}\ \text{Lawns per hour}$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 6 - Rational Expressions and Equations - 6.7 Applications Using Rational Equations and Proportions - 6.7 Exercise Set - Page 426: 12
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