Q: (1)v 1=? （2）t2=？ （3）v=？

Solution:

(1) The leveling speed of this bus from Pingtang to Mochong is v1= s1t1= 36km0.8h = 45km/h;

(2) It takes T2 = S2V2 = 30km75km/h = 0.4h for this bus to travel from Mochong to Duyun;

(3) The average speed of this bus from Pingtang to Duyun is V = ST = S1+S2T1+T2 = 36 km+30 km 0.8 h+0.4 h = 55 km/h. 。

Answer: (1) The leveling speed of this bus from Pingtang to Mochong is 45 km/h;

(2) It takes 0.4h； for this bus to travel from Mochong to Duyun;

(3) The average speed of this bus from Pingtang to Duyun is 55 km/h. 。