The number of miles, y, for x hours of time of the running times is represented by the graph below.

Which of the following describes the slope?


1. The slope indicates that the running time is 2.8 miles per hour.

2. The slope indicates that the runner time is 2.8 hours per mile.

3. the slope indicates that the running time is 5 miles per hour.

4. The slope indicates that the running time is 5 hours per mile.