Answer
11 km apart
Work Step by Step
x$^2$=13$^2$-12$^2$
x$^2$=25
x=5
y$^2$=20$^2$-12$^2$
y$^2$=400-144=256
y=16
y-x=16-5=11
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 5 - Review Exercises - Page 275: 41
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