A runs faster than B, running N meters per minute.

Then b runs every minute: (600 m-4n) ÷ 4 =150 m-n.

In the same direction counterclockwise, when A caught up with B, A ran 600 meters more.

The equation is as follows:

12[n-( 150-n)]=600

12[2n- 150]=600

24n=2400

N = 100 (m)

A: A runs 100 meters per minute.

B running every minute150m-100m = 50m.

Checking calculation: (100+50) × 4 = 600 (exactly a circle)

You did well in the exam. Good luck. Bye.