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 $r=\frac{d}{3}$.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
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 - Page 6: 18
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