Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 7 - Measurement - Review Exercises - Page 523: 23



Work Step by Step

The two towns are 40 km apart. As we the length between the towns can be measured in km, m cm and mm because it is a length unit. If we choose 40 m, 40 cm or 40 mm, it will be too less for distance between the two towns. So km is the correct answer.
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