Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 3 - Introduction to Graphing - 3.4 Rates - 3.4 Exercise Set - Page 187: 34


$87.5$ miles per hour

Work Step by Step

At 3 PM, the train was around 275 miles from Denver. By 5 PM, the train was 450 miles from Denver The increase in distance from Denver is: $=450-275=175$ miles The elapsed time from 3 PM to 5 PM is 2 hours. Thus, the average rate is: $=\dfrac{175\text{ miles}}{2 \text{ hours}}=87.5$ miles per hour
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