Answer
Marchers at the tail end of a long parade who are following a band may be out of step with marchers at the front because of the extra delay time for the band's music to reach them through the air
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 20 - Think and Explain - Page 389-390: 70
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