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Mathematics of AB
(1) departs one hour later, and the abscissa is 1.

(2) Calculate the slope a with the first point and the second point, and then calculate the intersection point b of the Y axis to obtain:

y 1 = 4x; y2= 15-5x

(3) When we met, y 1=y2, and then we got x=5/3, minus one hour's late departure, and walked for 40 minutes.

(4) y 1-y2= plus or minus 4 from the topic.

Solution, x1=11/9; X2= 19/9 is within a reasonable range. So when the distance is 44/9 and 76/9 kilometers, the two teams are 4 kilometers apart.