The graph shows the distance a car traveled, y, in x hours:

A coordinate plane graph is shown. The x-axis is labeled time in hours, and the y-axis is labeled distance in miles. The line passes through the points 2 comma 80, and 3 comma 120.

What is the rise-over-run value for the relationship represented in the graph?

40
80
1 over 40
1 over 80