# Chapter 3 - Introduction to Graphing - 3.4 Rates - 3.4 Exercise Set - Page 188: 39

$\dfrac{1}{45}$ gallons of gasoline per mile driven. This is around $0.022$ gallons of gasoline per mile driven.

#### Work Step by Step

After driving 90 miles, the car has consumed 2 gallons of gasoline. After driving 225 miles, the car has consumed 5 gallons of gasoline. The increase in gasoline consumed is: $=5-2=3$ gallons The increase in distance driven is $=225 - 90=135$ miles driven Thus, the average rate is: $=\dfrac{3\text{ gallons of gasoline}}{135 \text{ miles driven}}=\frac{1}{45}$ gallons of gasoline per mile driven

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