The first question should be the "midpoint", otherwise it is meaningless. According to the "midpoint", it is:

(1) Party A and Party B ride relatively from two places. Party A rides 20 kilometers per hour and Party B rides 22 kilometers per hour. When they met, there were still 3 kilometers from the finish line. How long is the whole journey?

Solution: Suppose Party A and Party B meet in X hours.

22X-20X=3X2

X=3

Then the whole journey: (22+20)X3= 126 (km)

(speed x time = distance)

As for this equation, you'd better draw a line yourself.

Because B's speed is faster than A's, when they meet, B has exceeded the midpoint by 3 kilometers, while A has not yet reached the midpoint, which is 3 kilometers away. In this case, B will walk 6 kilometers more than A, which is the distance of line B-the distance of line A =6 kilometers, which lists the equation.