Distance = time * speed, two cars are moving in opposite directions, and time is constant, so distance is directly proportional to speed. The speed ratio of A and B is 7: 1 1, so the distance ratio when two cars meet is also 7: 1 1, and the distance between ab is regarded as "unit 1".

When Party A and Party B meet for the first time,

7/(7+11) = 7/18 from A to B.

1118 from b to a.

After the same time.

7/18+7/18 =14/18 from A to B.

B from B to A and then from A to B (118+118)-1= 4/18,

After the same time.

A goes from A to B and then from B to A (14/18+7/18)-1= 3/18.

4/18+118 =15/18 from A to B.

According to the calculation, Party A and Party B meet at this time.

According to the topic, Serie A is 80 kilometers away from B, which is 3/ 18 of the total length.

Ab is 80/(3/ 18) = 480km apart.