![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
A and B two cars from AB two places at the same time, opposite, two car speed and distance between the two places When the two cars meet in the middle of the way, the distance between the two cars is 8:7. After the meeting, the two cars immediately return to their respective starting point. At this time, the handlebar speed of car a is increased by 25%, while the speed of car B remains unchanged. When car a returns to a, car B is still four fifths of an hour away from place B (1) The speed of car B is () km (2) How many km is the distance between the two places?
If the distance between vehicles a and B is 8:7, the speed ratio of vehicles a and B is 8:7
Vehicle B travels 40 △ 8 × 7 = 35 (km) per hour
The speed of a is increased by 25%, and the time is 4 / 5 of the original 1 (1 + 25%)
It's 1-5 times less than before
It takes four fifths of five to meet one fifths of five = four (hours)
The distance between the two places is (40 + 35) × 4 = 300 (km)
What's the speed ratio of 5:6 and the total length of 30km from the midpoint when the two cars run in opposite directions at the same time
Let the speed of a be 5 x km and that of B be 6 x km
From the meaning of the title
6x-30=5x+30
Solution
x=60
So the total length = 6 * 60-30 = 330 (km)
1. The mathematics problems (application problems) of grade five in primary school are difficult~~
At the first stop, 1 / 3 of the passengers got off the bus and 21 children got on the bus. As a result, there were not enough seats, so 12 children had to take one seat. How many passengers were on the bus? How many people were on the bus?
Please list the formula, the equation is OK, but have to complete out, and complete out ~ thank you~
Wrong. The second question is: how many seats are there in this car?
12/2=6
21-12=9
6+9=15
15 / (1 / 3) = 45 seats
45-15=30
30+21=51
RELATED INFORMATIONS
- 1. After practice, Ding Ding wrote 15 more words per minute than before. It is known that Ding Ding now writes twice as many words per minute as before. How many words per minute did he write?
- 2. A and B drinks with the same kind of fruits and vegetables but different concentrations, a drink weighs 40 kg and B drink weighs 60 kg. Now pour out a part from each of the two drinks, and the weight of the poured out part is the same, and then mix the poured out part of each drink with the rest of the other drink. If the fruit and vegetable concentrations of the mixed two drinks are the same, then pour out a part from each drink Out of the same weight is___ Kilogram
- 3. The function f (x) = x3-x2 + x2 + 14 is known. It is proved that there exists x0 ∈ (0,12) such that f (x0) = x0
- 4. A mathematical problem in function and equation We know the equation x & sup2; - (m-2) x-m & sup2 / 4 = 0 about X. if the two real roots X1 and X2 of this equation satisfy | x2 | = | x1 | + 2, find the value of M and the corresponding X1 and x2
- 5. It's not difficult, 1. When measuring the average speed of 100m for a student, the timekeeper starts to count the time when he hears the starting gun at the end. The result shows that the student's score is 10s. If the speed in the air is 340m / s, what is the actual average speed of 100m 2. There are two rolls of thin copper wire, one of which is marked with the words "(refer to the mark in the figure) = 0.3mm", the other roll of label falls off, and the diameter is unknown. If there is no copper length measuring tool, and you are given two identical pencils, can you measure the diameter of the copper wire more accurately? (refer to the mark in the figure) is a symbol similar to the Chinese character The most important thing is to look at the first question, and the second one is OK without looking at it!
- 6. A, C, B went fishing, a fished 11, B fished 7, C fished 7. Later, a tourist came, and four people roasted all the fish. Finally, the tourist paid 6 yuan. How can the money be divided reasonably?
- 7. Three math problems (one practical problem, 1、 Practical questions: 1. An iron block with a volume of 100 cubic centimeters is completely immersed in a rectangular container with a length of 5 cm, a width of 4 cm and a height of 20 cm. At this time, the water surface height is 12 cm. If the iron block is fished out, what is the water surface height? 1. Weld a cube with 24 cm long wire. The surface area of the cube is () A. 48 square centimeter b.36 square centimeter c.24 square centimeter 2. Saw a cuboid 12 cm in length, 9 cm in width and 5 cm in height into a cube of the same size with 3 cm in edge length. You can saw () at most A.98 B.45 C.12
- 8. 2 math problems = w= A cylindrical wood is 10 meters long. After it is cut into two cylinders, the surface area increases by 0.4 square meters. What is the volume of the original wood? 2. A cone-shaped wheat pile with a bottom radius of 2 meters and 8 meters. If the wheat is put into a cylindrical grain bin with a height of 4 meters and is just full, how many square meters is the bottom area of the cylinder?
- 9. Calculation and application problems in Grade 6 Winter vacation homework requires 50 calculation questions in Grade 6 with 3 or more steps. Application questions are not only for graphics, but also need 20 questions in one step. The questions must be in the second semester of grade 5 and grade 6. The simpler the questions, the better! ~ ~ but it can't be too simple! ~ ~ ~ which kind-hearted person can help me find the questions... Because I'm a novice... So I offer a reward of 15 points... Help me~~~
- 10. 1. The farmyard uses the traditional stone mill as a food processing tool to attract tourists? 2. In some places above 70 ° n, there is no night for about two months in a year, which accounts for half of the whole year___ %Due to the high latitude, the average sunshine time of Stockholm in July is about 75% of that of a day____ Hours
- 11. The speed ratio of a and B is 5:4 when they meet in two hours. The distance between AB and a is 270km. How many kilometers do a and B travel each hour?
- 12. B and B leave from ab at the same time. When they meet, the distance ratio of B and B is 6:5. After meeting, B is 11 kilometers faster than before, As a result, the two vehicles arrive at the destination at the same time. It is known that Party B has a total of 9 hours Last year, there were 600 red goldfish and black goldfish in the pond. This year, a quarter of the red goldfish swam away, while the number of black goldfish increased by a third. Therefore, there are 534 red goldfish and black goldfish in the pond this year. How many of them are red goldfish?
- 13. The two trains leave from a and B and meet at 48km from the midpoint after 4 o'clock. The speed of the slow train is five seventh of that of the fast train. What are the speeds of the fast train and the slow train?
- 14. How many kilometers is the distance between the two stations known to be 4 kilometers?
- 15. The fast and slow trains start from both places at the same time and run in opposite directions. They meet at 4km from the midpoint. The speed of the slow train is 6 / 7 of that of the fast train. How about the distance between the two places?
- 16. Party A and Party B walk from ab at the same time. When Party A walks at the midpoint of two places, Party B still has 1 / 3 of the distance from the midpoint of the whole journey. What is the speed ratio of Party A and Party B?
- 17. It is known that a goes from a to B and B goes from B to a. the ratio of the walking speed of a and B is 6:5. As shown in the figure, M is the midpoint of ab. there is a point C 26 km away from m and a point D 4 km away from M. anyone who passes through C has to slow down 14 and speed up 14 when passing through D. now a and B start at the same time and arrive at the same time. How many kilometers is the distance between a and B?
- 18. The speed of car a is 75% of that of car B. the two cars are going towards each other at the same time from AB and meet at 5km away from the midpoint. How many kilometers is the distance between AB and ab? What is the speed of each car?
- 19. I know that the speed of the local train is five sixths of that of the express train. The two trains are facing each other and meet at a distance of 4km from the midpoint. How far is it
- 20. Party A and Party B ride bicycles from both places at the same time. Party A travels 15km per hour and Party B 13km per hour. They meet 3km away from the midpoint to find the distance between the two places In fact, I have seen a lot on the Internet, but I don't know how to get the answer, for example, how to get the number, why to calculate this step ~ I give you all my wealth, although only a little