1. Two cars from two counties are driving in the same direction at the same time, and four cars meet after 4/9 hours. At this time, the B car is just 6/ 1 1 of the whole journey, and the A car is still 20 kilometers away from the midpoint of the whole journey. How many kilometers does this car travel per hour?

The whole journey is 20 kilometers

6/ 1 1- 1/2= 1/22

The whole journey is

201/22 = 440 km

Meet at the right time.

440× 6/11= 240km

B's speed is

240÷4 and 4/9 = 54 km

Shi Xiang Yu Jia hang

440-240 = 200 km

The speed is

200÷4 and 4/9 = 45km

2. Party A travels 6 2/3 kilometers per hour and Party B travels 4 2/7 kilometers per hour. Today, each of them comes from the same town. We only know that when they met, Party A's trip was 7/ 19, and Party A's trip was shorter than Party B's 10 km * *, and Party B left a few hours earlier than Party A?

10 km takes up the whole journey.

( 1-7/ 19)-7/ 19=5/ 19

The whole journey is

10.2475/19 = 38km.

Shi Xiang Yu Jia hang

38× 7/19 =14km

Meet at the right time.

38- 14 = 24 km

As soon as we met, A went.

14÷6 2/3 = 2. 1 hour

B went when we met.

24÷4 and 2/7 = 5.6 hours.

B is earlier than a.

5.6-2. 1=3.5 hours