The Johnson family is taking a car trip. they are driving at an average speed of 60 miles per hour. The graph shows their distance traveled over time. What does the point (5,300) represent in this situation?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?