Answer
$18.0 \ km$
Work Step by Step
Recall the Pythagorean theorem:
$$c^2=a^2+b^2$$
By using the Pythagorean theorem, we have
$$
a=\sqrt{c^2-b^2}=\sqrt{30^2-24^2}=18.0 \ km
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 12 - Test - Page 445: 5
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