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Xiao Jie and Xiao Li practice running and race walking on the 400 meter circular track respectively. If they start from the same starting point in the same direction at the same time, Xiao Jie and Xiao Li will meet for the first time in 2 minutes; if they start from the same starting point in the opposite direction at the same time, they will meet for the first time in 1011 minutes. How many meters / minute are Xiao Jie's running speed and Xiao Li's race walking speed
Let Xiao Jie's speed be x m / min per hour, then Xiao Li's speed is 400-1011x1011 M / min. according to the meaning of the question, we get 2 (400-1011x1011-x) = 400, and the solution is: x = 120, so 400-1011x1011 = 320 (M / min). A: Xiao Jie's speed is 320 m / min, Xiao Li's speed is 120 M
It's 400 meters long to throw a circle in the playground. Xiao Hong runs 5 / 3 times faster than her grandfather. They start from the same starting point along the same direction of the track at the same time
Five minutes later, Xiao Hong catches up with her grandfather for the first time. Do you know their running speed? Urgent, it's going to be tonight. If the answer is right,
Let grandfather's speed be V, then Xiao Hong's speed is 5 / 3 * v
According to the meaning of the title, we can draw a conclusion
5/3*v*5-v*5=400
be
V = 120 m / min
That is, grandfather's speed is 120 m / min, and Xiao Hong's speed is 200 m / min
The track of the sports ground is 400 meters long. Xiaohong runs 5 / 3 times faster than her grandfather
1. If Xiao Hong runs in the opposite direction immediately after catching up with her grandfather, will Xiao Hong meet her grandfather again in a few minutes?
2. If Xiao Hong's speed is 200 meters per minute, and grandfather's speed is 120 meters per minute, and he goes in the same direction at the same time, Xiao Hong is 100 meters ahead of grandfather. How long does it take for Xiao Hong to catch up with grandfather for the first time?
Using the equation solution,
2. 120x + 400-100 = 200X x = 3.66 minutes, that is, 3 minutes and 45 seconds; are 1 and 2 reversed? If so, 2 and 400 divided by (200 + 120) = 1.25, that is, 1 minute and 15 seconds
Xiao Ming has two yuan, one yuan can buy four bottles of mineral water, two yuan can buy eight bottles of mineral water, three empty bottles can change for one bottle of mineral water, finally, how much mineral water can Xiao Ming drink
Three empty bottles can be exchanged for one bottle of mineral water
The price of drinking 3 bottles of mineral water is only 3-1 = 2 bottles,
So Xiao Ming can drink it at last
8 △ 2 × 3 = 12 (bottle)
[scheme]
First borrow a mineral water bottle,
For the first time, buy 8 bottles,
There are 9 empty bottles, which can be replaced by 3 bottles,
After drinking three bottles, you can replace one with another
Then drink it and give the empty bottle back
Drink together: 8 + 3 + 1 = 12 (bottle)
RELATED INFORMATIONS
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- 2. Xiao Ming drank a cup of pure milk. He drank 6 / 1 of it for the first time and then filled it with water. He drank 1 / 3 of it for the second time and then filled it with water. He drank half of it and then filled it with water At last, he drank all his glasses. Does he drink more milk or water
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- 4. A cup of pure milk Xiao Ming drank a quarter of it for the first time, filled it with water and carefully stirred it up. He drank another third of it. How much pure milk was left
- 5. A glass of 320 grams of pure milk, I drank 1 / 4 for the first time, and then drank 1 / 4 after filling with water. How many grams of pure milk did I drink for the second time? Formula~~
- 6. A glass of 320 grams of pure milk, I drank 1 / 4 for the first time, and then drank 1 / 4 after filling with water. How many grams of pure milk did I drink for the second time? How do I do it? Why do you do this? Explain why
- 7. The milk bought by the shop is 35 cases more than that of yoghurt. The number of yoghurt cases is 1 / 3 more than that of milk. 5 cases of milk? Case of yoghurt? Case of yoghurt
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- 9. A bottle of 300ml of water, Dad drank 1 / 4, mom drank 1 / 3, the rest of Xiaoming drank up, Xiaoming drank this bottle of water how many?
- 10. Xiaogang bought a box of Chinese students' milk at school and put it on the floor. The contact area between the box and the floor is 0.08m #. The total weight of the box and milk is 6.6kg. The net content of each small bag of milk in the box is 2000ml.206g. What is the density of this kind of milk? What is the pressure of this box of milk on the floor? G = 10N / kg
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- 12. As shown in the figure, a and B practice running on the circular track. It is known that a circle of the circular track is 400 meters long, and B runs 6 meters per second. A's speed is 43 times faster than B's. (1) if a and B start in the opposite direction at the same time at a distance of 8 meters on the track, how many seconds will it take for them to meet for the first time? (2) If a starts in the same direction 8 meters in front of B, how many seconds will it take for them to meet for the first time?
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- 15. What is the cost value of a bottle of mineral water in Nongfu mountain spring The cost value of large and small bottles varies from 1.2 to 3 yuan (mainly on the train) for shops outside
- 16. Who knows the profit of the supermarket? My friend opened a supermarket. The daily turnover is 1000 yuan?
- 17. A person can buy mineral water with ten yuan, one yuan for a bottle, and three empty bottles can be exchanged for another. How many bottles can this person drink?
- 18. A supermarket transported 120 cases of juice, 25% more than the milk (1) How many cartons of milk have you brought in? (2) Use two ways to find out the number of boxes with more juice than milk Urgent! Good answer, more points!
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