Explain that after meeting, A ran the distance before B met, and B ran the distance before A met.

So the speed after B meets = the speed before A meets, and the speed after A meets = the speed before B meets.

So let the initial velocity of A be x m/min and the initial velocity of B be x+2m/min.

400(X+X+2)= 24

200(X+ 1)= 24

X+ 1=200/24

X=22/3

A: A The original speed was 22 meters per minute.