1, speed difference × catch-up time = distance difference.

2. Distance difference ÷ speed difference = catching up time (catching up in the same direction).

3, speed difference = distance difference, hurry.

4. the passing distance of a-the passing distance of b = the distance to catch up with the time difference.

The chasing and meeting problems involved in the movement of two objects on the same straight line or closed figure are usually classified as chasing problems. This kind is often found in exams. Br> is generally divided into two types: br> is a simple way for two people to catch up and meet; Br> One is that it is difficult for many people to catch up and meet. Br> Pursuit problem, the problem of chasing, meeting and colliding when two objects move on the same straight line, is usually classified as pursuit problem. Speed difference × catching up time = catching up distance, distance difference ÷ speed difference = catching up time (in the same direction).