Answer
3:20 PM
Work Step by Step
The documentary plays at: 12:00, 12:40, 1:20, 2:00, 2:40, 3:20, 4:00, ...
The movie plays at: 12:00, 1:40, 3:20, 5:00...
The first common time in both lists is 3:20. They both play again at 3:20.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1 - Page 257: 96
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