College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter P, Prerequisites - Section P.1 - Modeling the Real World with Algebra - P.1 Exercises: 18

Answer

$r=\frac{d}{3}$

Work Step by Step

Since distance equals rate times time, $d=3$ hours $\times$ $r$ mph. If you divide both sides by three, you get $r=\frac{d}{3}$.
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