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Here comes the math strongman.
Let the distance be x and the speed of Party A and Party B be y..

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!