1. Xiao Li travels from City A to City B at a speed of 5 kilometers per hour. Xiaolan travels from city B to city A at a speed of 4 kilometers per hour. They set out at the same time and met at 1 km from the midpoint of cities A and B. What is the distance between cities A and B?

2. There is 300g 8% brine in container A and 12 in container B..

5% salt solution is 120g. Pour water into container A and container B respectively, so that the concentration of salt solution in the two containers is the same. How many grams of water should be poured into each container at least? (Integral grams of water)

The ratio of a and b is 8: 5. After subtracting 34 from each number, the former is twice as much as the latter. What are these two numbers?