Danny runs at a constant rate of speed. At the end of 20 minutes, he has run 2.6 miles. At the end of 45 minutes, he has run 5.85 miles. If n represent the number of miles he has run, in terms of t, the number of minutes he has run, what is his average rate of change?

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?