You decide to race your buddy after school. The race starts at the 10 yard line and ends at the 50 yard line. How long was the race

Long of the race = 40 yard

Explanation:

The long of the race is measured from the distance in the beginning (10 yard line) to the distance and the end of the race (50 yard line). The distance of the race is the difference between both lines. That is:

Long of the race = 50 yard - 10 yard

Long of the race = 40 yard