1. Pursuit problem: Three basic quantities in the travel problem and their relationships: distance = speed × time, time = distance ÷ speed, speed = distance ÷ time.

2. Meeting problem: fast line spacing+slow line spacing = original line spacing, fast line spacing-slow line spacing = original line spacing.

3. Navigation problem: downstream (wind) speed = still water (wind) speed+current (wind) speed, and upstream (wind) speed = still water (wind) speed-current (wind) speed.

4. Water flow problem: water flow speed = (downstream speed-upstream speed) ÷2.

5. Engineering problem: three quantities and their relationship are: total workload = work efficiency × working time. When the total workload is not given in the title, let the total workload be 1, that is, the sum of all the workloads to complete a task = total workload = 1.

6. Ring runway and clock problem: the speed difference between two people on the runway, the distance of A+the distance of B = the circumference of the ring, the catching-up time = the distance difference ÷ the speed difference = the distance difference ÷ the catching-up time, the catching-up time × the speed difference = the distance difference, and the fast-slow distance = the circumference of the curve.