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1. Xiao Gang of the school track and field team finished most of the distance at the speed of 6 m / s in the 400 meter race test, and finally sprinted to the finish line at the speed of 8 m / s, with a score of 1 minute and 5 seconds 3. In exercise 1, if you ask "how far is Xiao Gang from the finish line to start sprinting", how do you solve it?
Let Xiaogang sprint x seconds away from the finish line, then run x seconds at the speed of 8 m / s and (65-x) seconds at the speed of 6 m / s
400 = 8x + 6 (65-x) gives x = 5, that is, the last 5 seconds sprint 5 times 8 = 40 meters. A: Xiao Gang sprints 40 meters from the end
Pro, take mine!
In the test of 400m Race, Xiao Gang of the school track and field team finished most of the distance at the speed of 6m / s, and finally at the speed of 8m / s
3. Xiao Gang of the school track and field team finished most of the distance at the speed of 6 m / s in the 400 meter race test, and finally sprinted to the finish line at the speed of 8 m / s, with a score of 1 minute and 5 seconds. How much time did Xiao Gang spend in the sprint stage?
The sprint took x seconds
8x＋6*(65-x）＝400
2x＝400-390
2x=10
x=5
Xiao Xiang of the school track and field team finished most of the distance at the speed of 6 m / s, and finally sprinted to the finish line at the speed of 8 m / s, with a score of 1 minute and 5 seconds. How far away is Xiao Xiang from the finish line?
Let Xiao Xiang start to sprint at x meters away from the end. According to the meaning of the question, we get: 400 − X6 + X8 = 65, simplify: 4 (400-x) + 3x = 1560, and solve: x = 40. A: Xiao Xiang starts to sprint at 40 meters away from the end
Xiao Gang and Xiao Ming start from the bookstore and school to go to the gymnasium at the same time. Xiao Gang walks 60 meters per minute on average. If two people arrive at the gymnasium at the same time
How much does Xiao Ming walk per minute
The bookstore is 360 meters away from the gymnasium, and the school is 240 meters away from the gymnasium
Two people start at the same time and arrive at the same time, which means that the time is equal. That is: Xiao Gang's distance divided by Xiao Gang's speed = Xiao Ming's distance divided by Xiao Ming's speed 360 △ 60 = 240 △ X
Or: 240 △ 60 = 240 △ 6 = 40 m / min
RELATED INFORMATIONS
- 1. 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?
- 2. Xiao gang jumped 85 times in the rope skipping competition, and the number of times he jumped was one second less than Xiao Hong. How many times did Xiao Hong jump If someone has a book on this topic, I hope he will write down the answers to the following four or five questions By 8:45
- 3. Xiaogang's mother is 50 years old, more than 12 years old. Let Xiaogang be x years old?
- 4. The distance between Xiao Li and Xiao Hong is 910 meters. They start from home and arrive at school at the same time in 7 minutes. Xiao Li walks 60 meters per minute. How much does Xiao Hong walk per minute
- 5. Xiaohong drove 1600 kilometers in six minutes and Xiaoli 1600 kilometers in eight minutes. What are their respective speeds?
- 6. Xiaojun's walking distance is 14 more than Xiaohong's, but Xiaohong's walking time is 110 more than Xiaojun's______ ．
- 7. Xiaohong walks 60 meters every minute from home to school. The school is 5400 meters away from Xiaohong's home. Xiaohong leaves home for school at 6:20. After walking for 10 minutes, she forgets to bring her red scarf. So she runs home at 80 meters per minute and goes to school at the same speed. Can Xiaohong get to school at 8:00?
- 8. Xiaoli, Xiaoqiang and Xiaohong, grade nine students of a certain school, went to the supermarket to participate in the social practice activities, in which they took part in the sales of certain fruits It is known that the purchase price of the fruit is 8 yuan / kg. Here is their conversation after the event Xiao Li: if you sell it at 10 yuan / kg, you can sell 100 kg per day Xiaoqiang: if you sell it at 13 yuan / kg, you can make a profit of 400 yuan per day Xiao Hong: through investigation and verification, I found that there is a functional relationship between the daily sales volume of Y kg and the sales unit price of X Yuan Xiaoqiang: I find that the daily sales volume is between 70kg and 100kg (1) Find the functional relationship between Y (kg) and X (yuan) (x > 0); (2) Suppose the daily profit of the supermarket is w yuan. When the unit price of the fruit is w yuan, what is the maximum profit? What is the maximum profit? PS: Digital conditions are different
- 9. Xiaoming and Xiaoqiang walk to school. Xiaoming walks one fifth more than Xiaoqiang. Xiaoqiang spends one eleventh less time than Xiaoming. Find the speed ratio between Xiaoming and Xiaoqiang Xiaoming and Xiaoqiang walk to school. Xiaoming walks one fifth more than Xiaoqiang. Xiaoqiang spends one eleventh less time than Xiaoming. What's the speed ratio between Xiaoming and Xiaoqiang
- 10. Xiaoming walks from place a to place B, and Xiaoqiang walks from place B to place a at the same time. When they reach the destination, both sides immediately return. During the walking process, their respective speeds remain unchanged. The first time they meet is 40 kilometers away from place a, and the second time they meet is 15 kilometers away from place B. then the distance between a and B is______ Kilometers
- 11. Xiao Ming and Xiao Hua practice running on a 400 meter circular road. They start from the same point and walk in the same direction at the same time. Xiao Ming runs 3.5 meters per second, and Xiao Hua runs 5.5 meters per second, After how many seconds. Two people meet for the second time?
- 12. Xiaoming and Xiaohua are running on the circular track. It takes 8 minutes for Xiaoming to run a lap and 10 minutes for Xiaohua to run a lap. Now it takes at least a few minutes for them to meet for the first time after they start from the starting point at the same time?
- 13. Xiao Ming and Xiao Hua practice running on the 400 meter track. They start at the same time and run in the same direction. After 200 seconds, Xiao Ming catches up with Xiao Hua. They run in the opposite direction and meet each other after 40 seconds. What's their speed per second?
- 14. Xiaoming and Xiaogang set out at the same place at the same time and run forward together along the 400 meter circular track. It takes three minutes for Xiaoming to run a lap and four minutes for Xiaogang to run a lap. How many minutes later will they meet at the same place?
- 15. Xiaoming's, Xiaogang's and school are on the same line Xiao Ming's home, Xiao Gang's home and school are on the same line. After school, Xiao Ming and Xiao Gang start to walk home from school at the same time. It is known that each clock of Xiao Ming runs 80m, which is twice as much as Xiao Gang's, but it is less than 50m. After 10 minutes, two people get home at the same time. How many meters is the distance between Xiao Ming and Xiao Gang
- 16. The perimeter of the track is 400m. Xiaoming runs 5 / 3 times faster than his grandfather. They start from the same starting point along the same direction of the track at the same time, Five minutes later, Xiao Ming caught up with his grandfather for the first time and asked about their running speed
- 17. Xiao Ming and Zhang Hua Run the 100 meter race. Xiao Ming reaches the finish 10 meters ahead of time. If Xiao Ming is 10 meters behind the start, who will reach the finish first (Xiao Ming and Zhang Hua have run the 100 meter race for many times, and each time Xiao Ming reaches the finish line 10 meters ahead of time. If Xiao Ming is 10 meters behind the starting point and Zhang Hua is still starting at the starting point, who will reach the finish line first?) (there must be a process of scientific problem solving)
- 18. Xiao Lin and Xiao Gang quarrel loudly in the self-study class for a small matter At this time, the monitor said: "a you have a bad influence on such a loud quarrel. B you have a bad influence on such a loud quarrel. Aren't you ashamed? C you have a bad influence on such a loud quarrel. D you have a great influence on such a loud quarrel
- 19. Kobayashi and Xiaogang run the 100 meter race. It is known that Kobayashi runs 1 meter in the first second and then runs 0.1 meter more than the previous second. Xiaogang runs at the speed of 1.5 meters per second all the time. Who can win? Come on, help me do it
- 20. Xiaogang and Xiaoqiang set out from a and B at the same time. Xiaogang rode a bicycle and Xiaoqiang walked along the same route at an average speed. Two hours after starting, they met, Xiaogang travels 24km more than Xiaoqiang when they meet. 0.5h after they meet, Xiaogang arrives at place B. what are their travel speeds? How long does it take Xiaoqiang to arrive at place a after they meet