![](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>)
one Car a and car B travel at the same time in two places 310 kilometers apart. Car a travels 40 kilometers per hour, car a goes ahead for one hour, and car B meets car a after three hours. How many kilometers per hour does car B travel? two There are two bags of rice. The weight of a bag of rice is three times that of B bag of rice. If 5 kg of rice is loaded into B bag of rice, the two bags of rice will be the same weight. How many kg of rice are there in each bag? three A and B run along the 400 meter circular track. They start from the same place at the same time. A runs 250 meters per minute and B 210 meters per minute. How many minutes does it take a to catch up with B? For the time being, these three questions. Thank you. I can give you a score. Although I don't have much, I won't waste it first. You can answer the questions first. If you answer well, I will give you 20 points
1. Set car B to travel x kilometers per hour
3（40+X）+40=310
120+3X+40=310
3X=310-120-40
3X=150
X=50
A: car B travels 50 kilometers per hour
2. Set B bag of rice as x kg
3X=X+5
3X-X=5
2X=5
X=2.5
X+5=2.5+5=7.5
A: a bag of rice is 7.5kg, B bag of rice is 2.5kg
3. Let a catch up with B in X minutes
（250-210）X=400
40X=400
X=10
A: after 10 minutes, a overtakes B
RELATED INFORMATIONS
- 1. Sixth grade math problem 3 It is known that the absolute value of x = 4, the absolute value of y = 1 / 2, XY < 0, and the value of X / y is equal to?
- 2. 1. The cross section of a cement pipe is annular, the diameter of the inner circle is 30 cm, and the radius of the outer circle is 20 cm? 2. A rectangular cardboard, 1.6 decimeters long, 8 cm wide, cut diameter is 4 cm circle, how many can cut at most? 3. The outer diameter of the train wheel is 0.8 meters. If it turns 400 circles per minute, how many kilometers does the train advance per hour? 4. Ten granaries with circular bottom will be built in the western suburbs. The perimeter of each granary bottom is 9.42 meters. What is the total area of the granary? 5. There are 150 cases of apples and pears in total, of which apples are half more than pears. How many cases of pears and pears are there? 6. The distance between a and B is 360 km. A bus and a train depart from the two places at the same time and meet each other in 4 hours. The speed ratio of the bus and the train is 5:4. What is the speed of the bus and the train?
- 3. The sixth grade math problem of Sandao primary school The area of an aquatic plant covering the surface of a lake doubles every day. It covers the whole lake in 16 days. After 14 days, what percentage of the whole lake is covered? There are two stores. If the profit of store a increases by 20% and that of store b decreases by 10%, the profits of these two stores are the same. The profit of store a is ()% of that of store B There is a cylinder whose bottom area is equal to the side area. If the bottom area of the cylinder remains unchanged and its height is increased by 3 cm, its surface area will be increased by 1130.4 square cm
- 4. 1. Dig a canal. 35% of the total length has been dug. The rest is 450 meters longer than the one that has been dug. How long is the canal! 2. Dig a canal. 25% of the total length was dug on the first day and 160 meters on the second day. At this time, 43% of the total length was not dug. Wow, how many meters were dug on the first day! 3. Boys account for 56% of the total number, 84 more than girls. How many people are there in all!
- 5. When you buy a car, you have to pay 10% more in installments. If you pay in cash, you can get a 95% discount. Uncle Lin calculates that there is a difference of 1800 yuan between the two methods. How much is the original price of the two cars The road repair team built a road, and 10 people built 800m in 10 days, which is exactly 1 / 9 of the road. According to this calculation, how many days will it take to complete the road
- 6. Given the equations 4x − 5Y + 2Z = 0 (XYZ ≠ 0), then x: Y: Z is equal to () A. 2：1：3B. 3：2：1C. 1：2：3D. 3：1：2
- 7. 100 7 If a kind of children's book is sold at the original price, it will make a profit of 0.24 yuan per book. Now it will be sold at a lower price. As a result, the sales volume will double and the profit will increase by 50%. How much will the price of each book be reduced
- 8. There are four cuboid beads of equal size in the hall. The bottom of each pillar is square, with a side length of 0.6 meters and a height of 4.2 meters. Now, how many square meters does it take to paste marble wall tiles on the surface of the pillars?
- 9. Sixth grade math 69 7 There are 42 passengers on K7 bus, which is two times more than that at the time of departure. How many passengers are there at the time of departure?
- 10. 1. The local train and the express train leave from the same station, and the local train is in the front, 48 kilometers per hour. After a period of time, the express train leaves from the same station, 72 kilometers per hour. After 2.5 hours, the express train catches up with the local train. How long did the local train take before the express train leaves? 2. Two water injection pipes inject water into the pool. A fills the pool for 5 hours and B fills the pool for 10 hours. How long does it take for two pipes to inject water at the same time to fill half of the pool? 3. To process a batch of parts, Party A and Party B shall work together for 4 days and Party A shall work alone for 6 days. Party A shall work for 2 days first and Party B shall work alone for the rest. How many days does it take for Party B to finish the rest? 4. To process a batch of parts, it takes 10 hours for Party A to do it alone, 8 hours for Party B to do it alone, and after 4 hours for Party A and Party B to do it together, the rest will be done by Party B alone. How long does it take for Party B to do the rest? 5. The teacher divided the candy for the children. If each person had 8, there would be 24 more. If each person had 10, there would be 2 less. How many students were there? 6. If someone makes 11 parts per hour within the specified time, he can finish them one hour ahead of time. If he makes 10 parts per hour, he can overfulfil 3 parts. How many parts are there in this batch? 7. Five carriages and four trucks can carry 24 tons of goods at a time, and ten carriages and two trucks can carry 21 tons of goods at a time? 8. Raising 8 horses and 15 cattle requires 162 kg of hay per day. It is known that feeding 5 horses needs 3 kg more hay per day than feeding 7 cattle. How many kg of hay does it need to feed a horse per day? What about cattle?
- 11. Three sixth grade math problems 1. The circumference of an isosceles triangle is 48CM, and the waist length is 40% of the circumference. Find the length of the bottom 2. A workshop originally planned to produce 120 pieces of goods, but actually produced 20 pieces more than the original plan. What percentage of the original planned production is the actual production? What percentage of the overproduction? 3. The construction team originally planned to complete a section of highway in 14 days, but actually completed the task four days ahead of schedule. How many percent of the daily work efficiency has been improved compared with the original plan?
- 12. Sixth grade math problem. 10 points! Urgent 1. There is a score. Add 2 to his denominator to get 7 / 9. Add 3 to his denominator to get 3 / 4? 2. Simple algorithm 13.8*6.5-4.5*6.5+9.3*3.5= 248-25 9 / 20-22.05= 3. The total weight of a and B oil is 64 kg. From a barrel to B barrel, the weight of a barrel is 1 / 7 of B barrel? In addition, it should be fast and accurate
- 13. A cone-shaped sand pile has a circumference of 12.56m at the bottom and a height of 1.8m. How many meters can be paved with this pile of sand on a road with a width of 8m and a thickness of 3cm?
- 14. Two cuboids, the ratio of their length is 3:2, the ratio of their width is 4:3, and the ratio of their height is 5:7? Another cylindrical measuring cup with a circumference of 12.56cm on the ground is filled with water. When a piece of ore is immersed in the cup, the height of water in the cup is 10cm to 15cm. What is the volume of the ore? Formula
- 15. A grain depot originally stores a batch of grain. After two fifths of it is transported away, it carries in 5.5 tons of grain. This means that the amount of grain to be stored is just 80% of the original amount of grain. How many tons of grain to be stored in the depot?
- 16. There are 109 students in the two classes of grade 6. It is known that 611 boys in class A and 49 girls in class B are in class A. how many boys are there in the two classes?
- 17. When 80% of the color TV sets are sold, the rest will be sold at a 20% discount. What's the actual profit of this batch of color TV sets? 2. After 75% of the total number of peaches sold in a supermarket during the May Day holiday, another 120 kg of peaches were transported. At this time, the total number of peaches increased by 5% compared with the original? 3. Xinglong shopping mall adopts the method of "get 50 free of 300" to promote sales. It is stipulated that if the purchase is over 300 yuan, 50 yuan gift certificate will be given, and the part less than 300 yuan will be omitted. The gift certificate can replace cash in the next shopping, but the part using the gift certificate can not enjoy the discount of "get 50 free of 300 yuan" A customer first bought a product with 1000 yuan, and then bought B product with these gift certificates and 280 yuan in cash. Q: how much discount does this customer enjoy when buying a and B products?
- 18. Urgent! Sixth grade math problem! Online, etc Math problem: Mr. Li bought a house with a unit price of 9400 yuan per square meter and an area of 101 square meters. He paid 2 / 5 of the total down payment and borrowed 300000 yuan from the bank's provident fund. The rest of the money was mortgaged by the bank. How many yuan does Mr. Li need to borrow? Detailed description, help you, have to say clearly, the answer is 269640, please step by step to explain the idea, good words plus points. Urgent! Online, etc
- 19. Xinxin garment factory has to produce a batch of school uniforms. The ratio of completed sets to unfinished sets in the first week is 1:3. If 250 sets are produced again, half of this batch of school uniforms will be finished. How many sets are there in total?
- 20. 【1】 The tire diameter of a car is 8dm, and it runs 45.216km at 1 hour. How many turns does the car wheel turn per minute? 【2】 Lili read a book, read 24 pages on the first day, read 25% of the whole book on the second day, and read 40% of the whole book in two days. How many pages are there in this book? 【3】 There is a round iron ring with a diameter of 20cm. Now we need to fold it into a rectangle, so that the ratio of length to width is 3:1. What is the length and width of the rectangle? 【4】 The ratio of a, B and C is 1:2:3. The average number of a, B and C is 120. What are the numbers of a, B and C?