To find the average speed of the winner of the Easy Math 500 mile race, we can use the formula for average speed:
\[ \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}} \]
The total distance of the race is 500 miles, and the total time taken to complete the race is 4 hours. Plugging in these values gives us:
\[ \text{Average Speed} = \frac{500 \text{ miles}}{4 \text{ hours}} = 125 \text{ miles per hour} \]
Therefore, the average speed of the winner of the race is 125 miles per hour.