Answer:
He has run 40 yards.
Explanation:
A football playing field is usually 100 yards long. That means, the mid-field will be 50-yard line.
If a player carries the ball from his team's 15-yard line to the opposing team's 45-yard line, it means he first runs from his team's 15-yard line to the mid-field line and then from mid-field line to the opposing team's 45-yard line.
So, the distance from his team's 15-yard line to the mid-field
yards.
and the distance from the mid-field to the opposing team's 45-yard line
yards.
Thus, the total distance he has run
yards.