Fifty seconds after departure, we met head-on for the first time. After 30 seconds, Xiao Wei passed the starting point, and then we knew that it would take 80 seconds for Xiao Wei to complete a lap. V Xiao Wei: V small method =5:3 Let V Xiao Wei =5x, then V small method =3x, runway length 5x*80=400x, and catch-up time t, then 5xt-3xt=400x, then t=200.

(2) Because the pursuit time is 200 seconds, the position of the first pursuit in the same direction is 200-80-80-30= 10 seconds away from the starting point in the running direction of Xiao Wei, which is 40 seconds different from the position of the first frontal encounter, so V Xiao Wei =200/40=5, then x= 1 is 400.