### Home > PC > Chapter 10 > Lesson 10.2.1 > Problem 10-75

10-75.

Driving from Cleveland to Washington, D.C., Ernie averaged

How fast was he going after one hour?

Ernie averaged

mph for the first hours. Does this mean he drove at a constant rate? What was his average rate for his entire

hour trip? average speed

total distance / total time

Determine Ernie's total distance from the given information.

Then divide by the total time (hours).