On several mathematical problems of fractions (1) The distance between station a and station B is 1280km. After adopting the "harmony" EMU to increase the speed, the running speed of the train is 3.2 times of the original, and the time from station a to station B is shortened by 11 hours, so the speed of the train after increasing the speed can be calculated (2) The distance between a and B is 36km. A and B start from a and B at the same time and walk towards each other. When they meet, a is 16km away from B. after meeting, they continue to move forward. A arrives at B 1.8h earlier than B arrives at a. find out the walking speed of a and B

On several mathematical problems of fractions (1) The distance between station a and station B is 1280km. After adopting the "harmony" EMU to increase the speed, the running speed of the train is 3.2 times of the original, and the time from station a to station B is shortened by 11 hours, so the speed of the train after increasing the speed can be calculated (2) The distance between a and B is 36km. A and B start from a and B at the same time and walk towards each other. When they meet, a is 16km away from B. after meeting, they continue to move forward. A arrives at B 1.8h earlier than B arrives at a. find out the walking speed of a and B

1. Set the speed of the train before increasing the speed as X (km / h)
Then 1280 / X-11 = 1280 / (3.2X)
The solution is x = 80, so the train speed after speed increase is 3.2X = 256 km / h
2. Let the speed of a and B be x, y (km / h) respectively
Then the following equations can be obtained from the problem
20/x=16/y
36/x=36/y-1.8
By solving the above equations, we can get x = 5, y = 4
So the speed of a and B is 5km / h and 4km / h respectively