Answer
$15^{\circ}$ of longitude
Work Step by Step
Traveling $360^{\circ}$ in longitudes will reset the watch by 24 hours. So, to reset the watch by 1 hour, you have to travel $360/24$ = $15^{\circ}$ of longitude between the time zone boundaries.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 1 - Measurement - Problems - Page 9: 10
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