Aunt Wang leaves at two o'clock in the afternoon, and Uncle Li leaves at half past two in the afternoon. Aunt Wang walks at a speed of 0.07 km per minute. Uncle Li met Aunt Wang in 15 minutes. Aunt Wang's driving distance in the first 30 minutes was 0.07 times 30 = 0.2 1 km. According to the distance, which is equal to speed times time, the equation can be listed as 0.2 1+65448.
With the development of time, two moving objects will meet face to face when they move towards each other or retreat on the circular runway. This kind of problem is called meeting problem. It is characterized by two moving objects walking a full distance together. According to the quantitative relationship, the encounter problem can be divided into three types: finding the distance, finding the meeting time and finding the meeting speed. The formula is that the total distance is equal to the speed sum of speed A and speed B multiplied by the meeting time, equal to the total distance divided by the speed sum of speed A and speed B, and the other speed is equal to the speed sum of speed A and speed B minus a known speed.