# Chapter 9 - Section 9.4 - Variation and Problem Solving - Exercise Set: 21

$54$ mph

#### Work Step by Step

$R=\frac{k}{T}$ $R=45; T=6$ $45=\frac{k}{6}$ $k=270$ $R=\frac{270}{T}$ When $T$ is 5, $R=\frac{270}{5}$ $R=54$ mph

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