1. This is a permutation and combination problem, which will be learned in high school, but this is relatively simple. A is already red, so B can only choose one of the three colors, C can only choose one of the two colors, and D has no choice, so it is 3 * 2 *1= 6;

2. 10 point, with a difference of 36 kilometers. Two hours later, the two men staggered by 36km, so Party A * * walked 72km-36k m/ hour in two hours and learned that Party A and Party B met at 1 1. The distance between AB makes Party A and Party B walk for three hours to meet, so the distance is 36*3= 108km.