1. We can set the speeds of A and B cars to XY respectively. Then, when they meet in eight hours, we can make an equation. After two hours, the express train is 350 kilometers away from B car and the local train is 250 kilometers away from A car. We can make a second equation.

2. One piece, with copper accounting for 3/5 and zinc accounting for 2/5. It can be assumed that X is taken from one and Y is taken from the other, and an equation can be made with the new alloy 1 16 with the copper-zinc ratio of 65438: 5.