Answer
Change in elevation: $140$ m.
Work Step by Step
Refer to Figure 28:
since the contour interval is $20$ m, from $A$ to $B$ the change in elevation is $540-400=140$ m.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 15 - Differentiation in Several Variables - 15.1 Functions of Two or More Variables - Exercises - Page 765: 48
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