This is a question of relative rate of change. Generally speaking, let X=X(T) and Y=Y(T) be derivative functions, and there is a certain relationship between variables x and Y, then there must be a relationship between the change rate DX and the change rate d y, and these two fog-related change rates become mutual change rates.

Y=F(X), F(X) is derivable, and the ratio of DY to DT = f' (x) dx and dt.

Triangle ADE and triangle ABC

AD ratio AB=DE ratio BC

(Y-X) ratio Y= 1.8 to 5 Y=(2516) x.

DY ratio DT=25DX ratio 16DT.

DX ratio DT= 1.6

Therefore, the moving speed of the graphic endpoint is 2.5 meters per second.