Sitting on a moving train, Xiao Ming saw from the window that it took 6 seconds for the oncoming truck to pass, and the truck was known to be 168 meters long. Later, he saw from the window that it took 12 seconds for the train to pass a 180 meter long bridge______ Kilometers

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• 1. Sixth grade problems, the distance of (urgent! Online, etc ~ ~ ~) A and B walk from a to B at the same time. A's walking distance is 10% larger than B's. in a certain period of time, a's steps are 10% less than B's, 1) Who can get to B first? 2) If the time difference between two people arriving at B is 30 seconds, how long does it take for the first person to arrive from a to B? PS: process ~ ~ ~ fast ~ (≥ ▽≤) / ~ Lala
• 2. 1. A factory plans to produce a batch of parts. It completes three seventh of the plan for the first time, one half of the plan for the second time, and 450 parts for the third time. The result is more than one fourth of the plan. How many parts are planned to produce? 2. Boys in Grade 5 account for five ninth of the total number of people in the whole year, and the ratio of boys to girls in Grade 6 is 4:5, The number of girls in the two grades is the same. How many boys are there in the two grades? 3. The number of students in the first grade of Yuhong primary school is two-thirds of the total number of students in the second and third grades, and the ratio of the number of students in the third grade to the total number of students in the first and second grades is 1:4. There are 120 students in the second grade, and how many students are there in the first and third grades?
• 3. Xiao Ming's birthday is on May 23, and my birthday will be 100 days later. What month is my birthday
• 4. Let's take the formula instead of the solution of the equation 1. For a project, Party A and Party B work together for 8 days. Now, Party A and Party B work together for 5 days, and the remaining party a work alone for 6 days. How many days does it take for Party A and Party B to complete the project separately 2. Buy back a batch of basketball, volleyball and football. It is known that basketball accounts for 25% of the total. Football is 40 more than basketball. The ratio of volleyball and football is 3:2. How many balls are there in total 3. Cut a cube wood block with an edge length of 90cm into a cylinder with the largest volume. What is the volume of this cylinder? If it is cut into a cone with the largest volume 4. The roller is a cylinder with a width of 1.5m. The radius of the cross section of the roller is 10 decimeters. How many square meters of road can be rolled in 15 minutes based on rolling 8 circles per minute 5. The passenger car and the freight car drive from ab at the same time. When the two cars meet, the passenger car takes 70% of the total length. The freight car is 400 kilometers away from the midpoint. It takes 20 hours for the passenger car to complete the whole journey. How many kilometers does the passenger car walk per hour
• 5. Ask parents a math problem, you can use equation or arithmetic, equation with a dollar, death of human! The school bought the same amount of football and basketball, and later bought 20 football, 15 basketball, this is basketball less than football 1 / 16, ask: now football and basketball how many?
• 6. There are 180 peach trees and pear trees in the orchard. It is known that the number of peach trees is just four times that of pear trees. How many of the two kinds of fruit trees are there? If the first condition in the above question is changed to "there are 108 more peach trees than pear trees planted in the orchard", how to solve the equation?
• 7. Find the formula, not the equation 1. A bowl of rice, the first day was stolen by the mouse more than 1 / 5 of 16 kg, the next day was stolen by the mouse the remaining 1 / 3 less than 4 g, there are 260 g, the original bowl of rice how many grams? 2. A pile of apples to four people, a took 1 / 6 of them, B took the remaining 2 / 5, C took the remaining 3 / 4, D took the last 15, How many apples are there in this pile? 3. There are several tons in the coal yard. Half of them are transported in the first day, 450 tons are transported in the second day, and half and 50 tons are transported in the third day. As a result, there are 600 tons of coal left. How many tons of coal are there? The first mouse stole more than 1 / 5 of 16 grams, which was not a typo.
• 8. A and B planes fly from two airports 750 km apart at the same time and arrive at the same Midway Airport for half an hour. If the speed of a plane is 1.5 times that of B plane, what is the speed of B plane?
• 9. 1. After a batch of goods are transported away, 800 tons are left, which is a quarter more than the remaining goods. How many tons more than the remaining goods? How many tons? 2. The ground of a cuboid becomes 7 cm square in time, its side area is 504 cm square, and its volume is multi scan cubic centimeter? 3. There is a cuboid wood block 14 cm long, 9 cm wide and 4 cm high. The worker can cut it into the largest cuboid wood block (regardless of the loss of the saw) What's the volume of a small wooden block raised here? What's the volume of a small block of wood? What is the surface area of the far cuboid? What is the surface area of the remaining part after cutting out the first block? How many cubes can you combine? The road construction team plans to build 4000 meters of roads, three quarters of which have been built. How many kilometers have they built and how many meters have they drunk? A bucket of water, using three quarters of his, is exactly 15 kg. How many kg of water is there?
• 10. Wang Ma went to the vegetable market to buy pork, and the vendor weighed her 4 jin. Wang Ma suspected that the vendor's scale was not accurate. She added her own 100 g weight into the scale and asked to weigh it again. The result was 4.25 Jin. How many liang of pork should the vendor supply Wang Ma?
• 11. How about the distance and pursuit in the fifth grade of primary school? 1. A and B start from a certain place at the same time and travel in the same direction. A's speed is 12 kilometers per hour, which is 3 kilometers slower than B's. it takes 0.25 hours for B to repair the car on the way. When B catches up with a, how many hours did a ride? 2. The apprentice makes 8 parts per hour, and the master makes 14 parts per hour. The apprentice makes 24 parts first, and then the master starts to process them. How many hours after the master makes them, do they make the same parts? 3. They worked 8 hours. The apprentice made 8 pieces per hour, and the master took 3 hours to repair the machine. After work, the master made 11 more than the apprentice. How many pieces per hour does the master process?
• 12. In a hurry! Answer in half an hour! Elementary school mathematics sixth grade score application problem! There are two piles of coal a and B. pile a is 120 tons more than pile B. If 25 tons are transported from pile B to pile a, the weight ratio of pile AB is 5:3. How many tons of coal are there in pile a and pile B?
• 13. Seek master solution elementary school mathematics application problem ~! Urgent~~~~~~ Lele drinks a glass of milk in four times. For the first time, he drinks 1 / 5 of a glass, and then fills it with water. For the second time, he drinks 1 / 4 of a glass, and then fills it with water. For the third time, he drinks 1 / 2 of a glass, and then fills it with water. For the fourth time, he drinks it all in one gulp. Does Lele drink more milk or more water
• 14. 1. A section of road AB is 240 meters long. A starts from a to B. half an hour later, B starts from B to a at the speed of 36 km / h. When a and B meet, the time ratio of a and B is 6:5, 2. The price ratio of a and B is 7:3. After the price rises by 70 yuan, the price ratio is 7:4. How much is the original price of a and B? 3. There are two kinds of apples, the price ratio is 5:4 and the weight ratio is 2:3. After mixing the two kinds of apples into 100kg, the unit price is 4.4 yuan per kg. How much is the original unit price? It's better to solve it by arithmetic
• 15. Non application questions on prime numbers Fill in the appropriate prime number in the brackets to make the formula true! 98=(）X（）x（） 100＝（）x（）x（）x（）x（） 110＝（）x（）x（） 112＝（）x（）x（）x（）x（） 114＝（）x（）x（）x（）
• 16. Several simple primary school mathematics calculation problems What can be calculated simply should be calculated simply: 11.58-（5/11+1.58） 24*（1/3+8/3+7/12） 120.8*3/4-0.8*3/4 99 * 97 / 98 thank you {(this symbol means multiplication *) (/ followed by denominator)
• 17. For a project, Party A will do it alone in 15 days and Party B will do it alone in 20 days. After three days of cooperation between the two teams, team B will do the rest of the project alone. How many more days will it take to complete? -------------------------------------------------------------------- Please send the formula and solution to me if you know the answer,
• 18. For a project, Party A and Party B work together for 20 days, and Party A has worked together for 2 days after 3 days to complete 1 / 5 of the whole project. How many days does it take for Party A and Party B to work alone? Remember, ”Three days later, it was followed by "three days later, B followed". Just understand.
• 19. If a work is done alone, Party A can complete it two days ahead of schedule. Party B can complete it three days ahead of schedule. Now, after two days of cooperation, Party B will continue to do the rest alone, just in time. If cooperation, how many days will it take to complete the project?
• 20. When a boat finds a leak, it has entered some water, and the water enters the boat at a constant speed. If 10 people clean the water, it will finish in 3 hours; if 5 people clean the water, it will finish in 8 hours. If it is required to finish in 2 hours, it should be arranged___ A man washes for water