The distance covered is 15.072 km
Step-by-step explanation:
The diameter of the circular path is d = 400 m.
Hence, the radius of the circular path is

The circumference of the circular path is

In one round the distance covered is equal to the circumference of the circular path.
Hence, the distance covered in 12 round is equal to
12 × C
=12 × 1256
= 15072 m
= 15. 072 Km