Answer
See below
Work Step by Step
Let $x$ be your time of arrival and $y$ be your friend's time of arrival.
If you arrive before your friend
$$y- x\leq 10$$
If your friend arrives before you do:
$$x-y \leq 10$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - Mixed Review of Problem Solving - Page 705: 2b
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