To solve the equation, the distance between the two places is 2500 meters. Party A and Party B start from the two places at the same time and walk towards each other. Party A travels 150 meters per minute. After 10 minutes, they meet with Party B. Party B travels 150 meters per minute

To solve the equation, the distance between the two places is 2500 meters. Party A and Party B start from the two places at the same time and walk towards each other. Party A travels 150 meters per minute. After 10 minutes, they meet with Party B. Party B travels 150 meters per minute

Formula solution:
2500 / 10 - 150 = 100 (m)
A: B walks 100 meters per minute
Equation solution:
Let B walk x meters per minute
(150 + x)×10 = 2500
Expanded 10x = 1000
The solution is x = 100 (m)
A: B walks 100 meters per minute

A. B is 3 kilometers away. A starts from a and walks to B. B starts from B and walks to a. the two start at the same time. After 20 minutes, they meet and pass by
After 10 minutes, the remaining distance of institute a is twice that of institute B. find out the speed of two people (binary linear equations)

The speed sum of the two is 3000 △ 20 = 150m
Ten minutes after the meeting, Party A and Party B walked half of the whole journey, and the rest of the journey was half of the whole journey, that is, 3000 △ 2 = 1500 meters
In 10 minutes, a walked 1500 x 1 / 3 = 500, B walked 1500 x 2 / 3 = 1000
Then the speed of a is 500 △ 10 = 50 m / min = 3000 m / h, and the speed of B is 1000 △ 10 = 100 m / min = 6000 m / h
Equation:
Analysis: 20 minutes = 1 / 3 hour, 10 minutes = 1 / 6 hour; after meeting for 10 minutes, Party A and Party B walked half of the whole journey, and the rest of the journey was half of the whole journey. It is known that the rest of the journey of Party A is twice that of Party B, that is, the journey of Party B is twice that of Party A,
Let a speed be x km / h and B speed be y km / h
（x+y）×1/3=3 (1)
1/6×y=1/6 × x ×2 (2)
The solution is x = 3 km / h
Y = 6 km / h
A: the speed of a is 3 km / h, and that of B is 6 km / h

The distance between a and B is 3 kilometers. A starts from a and walks to B. B starts from a and walks to a. the two start at the same time and meet in 20 minutes: half an hour later
The remaining distance of a is twice that of B. find the speed of two people

Speed sum = 3 △ 20 / 60 = 9 km / h
Let a speed x km / h, B speed y km / h
x+y=9
3-1 / 2x = 2 (3-1 / 2Y), that is, 2y-x = 6
y=5
x=4