Answer
$2$ km.
Work Step by Step
$38-18=10$ degrees per km. The difference in temperature is $20$ degrees. It is $2\cdot10$ degrees, thus the depth is $2$ km.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 93: 59
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