Answer
$\frac{3\text{ inches}}{\text{second}}$
Work Step by Step
21 inches every 7 seconds --> $\frac{21\text{ inches}}{7\text{ seconds}}=\frac{21\text{ inches}\div7}{7\text{ seconds}\div7} = \frac{3\text{ inches}}{\text{second}}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 6 - Section 6.2 - Integrated Review - Ratio, Rate, and Proportion - Page 429: 17
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