Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 4 - Elementary Number Theory and Methods of Proof - Exercise Set 4.3 - Page 178: 35

Answer

4:40 PM

Work Step by Step

The LCM of their lap times will be the first time they both are at the start (after starting) and this is 40, so the running time will be 40 minutes and the time 4:40 PM.
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