Xiao Gang of the school track and field team finished most of the distance at the speed of 6 meters per second in the 400 meter race test, and finally sprinted to the end at the speed of 8 seconds per second, with a score of 65 seconds?

1 minute 5 seconds = 65 seconds
Set time for better work
If the sprint takes x seconds, the original sprint takes 65-x seconds
8X+6（65－X）＝400
X＝5
The sprint distance is 8 * 5 = 40 meters,

Xiao Gang of the school track and field team when Xiao Gang of the school track and field team is testing in the 400 meter race, he should first use 6 meters per meter for analysis, and use one yuan once. Thank you, I want to pass
2. Xiao Gang of the school track and field team in the 400 meter race test, Xiao Gang of the school track and field team first finished the test at the speed of M / s, first finished the test at the speed of 6 m / s, first finished most of the distance, finally finished most of the distance at the speed of 8 m / s, and finally sprint to the end at the speed of M / s, The score is minutes and five seconds, the score is one minute and zero sprint, and the score is minutes and zero seconds when we reach the end. How far does Xiao Gang start to sprint from the end?

Hello ~ ~ I'm glad to provide you with professional solutions~~
Let Xiaogang sprint from X meters away from the finish line
According to the meaning of the question, the equation (1 minute and 5 seconds, 65 seconds) can be listed
(400-x)÷6+x÷8=65
The solution is: x = 40
Xiao Gang began to sprint 40 meters away from the finish line
I hope I can help you~~

Xiaogang is 2 years older than Xiaoming, Xiaoqiang is 3 years older than Xiaoming. The three people's ages add up to 35 years old. How old are the three people? It's a mathematical solution, otherwise don't!

35-3 - (2 + 3) = 27 (years old)
Xiaoming 27 / 3 = 9 (years old)
Xiaoqiang 9 + 3 = 12 (years old)
Xiaogang 12 + 2 = 14 (years old)

The number of rope skipping of Xiaoqiang is 1 / 5 of Xiaoming's, the number of rope skipping of Xiaogang is 7 / 8 of Xiaoqiang's, Xiaogang jumps 35 times. Xiaoming and Xiaoqiang jump respectively
Xiaogang jumped 35 times. How many times did Xiaoming and Xiaoqiang jump?

Xiaoqiang * 7 / 8 = Xiaogang
Xiaoqiang = 35 / (7 / 8) = 40
Xiaoming * 1 / 5 = Xiaoqiang
Xiaoming = 40 * (1 / 5)
Xiao Ming = 200

Xiao Gang of the school track and field team finished most of the distance at the speed of 6 meters per second in the 400 meter race test, and finally sprinted to the end at the speed of 8 seconds per second, with a score of 65 seconds?