8 to 10, 2y+2y+36 = x.
10 to 12 points
The road taken by the two men was repeated for 36 kilometers.
Then 4y+4y-36 = X.
Get 4y+36=8y-36.
Get y= 18.
X = 108km。
If the speed of two people is different, let the speed of B be Z.
According to the above method, the equation is listed and simplified to get y+z=36.
The total time is 4,4y = x, and 4z=x also gives y=z, so the total distance is 108km.
A little messy, hehe!