Equation: Xiaoli and Xiaoming are on the 400 meter circular track. Xiaoli runs 220 meters per minute and Xiaoming runs 280 meters per minute. They run in the opposite direction at the same point at the same time. How many minutes do they meet? Lie equation: 2. In the flight model competition, the first model plane flies 480 meters less than the second model plane. It is known that the speed of the first model plane is 1 m / s faster than that of the second model plane. The flight time of the two model planes in the air is 12 minutes and 16 minutes respectively. How much distance did the two model planes fly?

Equation: Xiaoli and Xiaoming are on the 400 meter circular track. Xiaoli runs 220 meters per minute and Xiaoming runs 280 meters per minute. They run in the opposite direction at the same point at the same time. How many minutes do they meet? Lie equation: 2. In the flight model competition, the first model plane flies 480 meters less than the second model plane. It is known that the speed of the first model plane is 1 m / s faster than that of the second model plane. The flight time of the two model planes in the air is 12 minutes and 16 minutes respectively. How much distance did the two model planes fly?

1. 400 / (220 + 280) = 4 / 5 (minutes), so 4 / 5 minutes meet. 2, 16 minutes - 12 minutes = 4 minutes = 4 * 60 = 240 seconds. Also because the first plane is 1 meter / second faster than the second plane per second. That is to say, in the 240 seconds, the first plane travels 240 meters less than the second plane, which is similar to the 480 meters in the title