Given:
Length = 100 yards
Width = 53 yards
Rectangle shape
Jos ran the diagonal length. So, he formed a right triangle. The length Jos ran would be they hypotenuse.
a² + b² = c² ² where c = hypotenuse
100² + 53² = c²
10,000 + 2809 = c²
12809 = c²
c = √12809
c = 113.18 yards.