1，A 2，B 6

2.A 3，B 5

3.A 4，B 4

Idea: Box A can be transported by car B, and 8 cars can only transport 280 boxes (one car can transport more than car B 10 boxes), so at least 2 cars are needed; One car to transport Box B and eight cars can only transport 160, so Box B needs at least four cars.