Answer
The rate of change is 25 meters per second.
Work Step by Step
You have the points: (3,75)(6,150)(9,225)(12,300).
The rate of change is constant so we can pick two points and plug them into $\frac{y2-y1}{x2-x1}$:
$\frac{y2-y1}{x2-x1}$ and (6,150),(12,300)
Thus;
$\frac{300-150}{12-6}$=$\frac{150}{6}$=25.
The rate of change is 25 so the car travels 25 meters every second.
