Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 1, Equations and Inequalities - 1.5 Use Problem Solving Strategies and Models - 1.5 Exercises - Problem Solving - Page 38: 25


3.75 kilometers per hour

Work Step by Step

Given, relevant information: 30 kilometers were traveled in 8 minutes. The formula for speed (represented by the variable $r$) is $r=\frac{d}{t}$ The variable $d$ represents the distance traveled, and the variable $t$ represents the time spent traveling. If we substitute these known variables into the equation, $r=\frac{30}{8}$. When simplified, this fraction is equivalent to $\frac{15}{4}$, which is equal to $3.75$. Thus, the train was traveling at an average speed of 3.75 kilometers per hour.
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