Answer:
-60 miles per hour
Step-by-step explanation:
We are given the following information in the question:
Distance left: 480 360 240 180
(miles)
Time: 2 4 6 8
(hours)
To find the constant rate of change in miles per hour we use the following formula:
Constant rate in miles per hour = [tex]\frac{y_2 - y_1}{x_2 - x_1}[/tex], where [tex]y_2, y_1[/tex] are the distances in miles and [tex]x_2, x_1[/tex] are time in hours.
Putting down values from the given data in the formula, we get:
[tex]Rate = \frac{360 -480}{4-2} = \frac{-120}{2} = -60\text{ miles per hour}.[/tex]
Here, the negative sign tells us about the inverse relationship that as the time increases the distance is decreasing.
