2, the number of fish in large and small fish tanks is equal. If you take five fish out of the small tank and put them into the big tank, the number of fish in the big tank is six times that of the small tank.
Q: How many fish are there in each fish tank?
3. There are two trains, one with a length of 180m and an average speed of 15m/ s and the other with a length of 150m and an average speed of 18m/ s.. How long did it take the two trains to meet and leave?
4. Two cars, A and B, are driving in opposite directions and meet at the midpoint of 40 kilometers apart. It is known that the speed of A is three times that of B. What is the distance between A and B?
5. A total of 160 passengers * * * from station A to station C by beeping. In Mile Mile, there are 17 passengers in train A and 23 passengers in train B. The number of passengers in both trains is equal to that in station C. How many people are there in each train?
6. The school bought 83 books, of which science and technology books are twice as many as story books, and story books are five more than literature and art books. Q: How many books are there in each of the three books?
7. The distance between the two places is 978 kilometers. Two trains leave from two stations at the same time and meet in six hours. It is known that one train has a speed of 78 kilometers per hour, and how many kilometers per hour is the other train?
The sum of 8 and 5 consecutive natural numbers is 225. What is the first number?
9. Dictate arithmetic progression, sum, item number, and formula of last semester.
10, the speeds of A, B and C are 30km, 40km and 50km per minute respectively. Party A and Party B walk towards each other at the same time at the place A, and Party C meets Party A 15 minutes after meeting Party B, so as to find the distance between AB.
1 1, it takes four hours for the ship to sail 48km downstream and six hours for the ship to sail 48km upstream. Now it's 72 kilometers from Port A to Port B, and a board fell off during the voyage. Q: When the ship arrives at Port B, how far is the plank from Port B?
12, the speed of the ship in still water is 20 kilometers per hour, and it takes 8 hours to sail upstream from Port A to Port B, 1 14 kilometers. Q: How many hours does it take to return to Port A from Port B?
13, TV is sold in shopping malls. More than half of the total 10 sets were sold in the morning, more than half of the remaining 20 sets were sold in the afternoon, and finally 95 sets were left. How many TVs were there in the mall?
14, there are two trains. One train conductor is 130m, traveling at a speed of 23m per second, and the other train is 250m, traveling at a speed of 15m per second. How long does it take for two trains to meet and leave?
15, the school sent students to plant trees, and each person planted 6 trees, with a difference of 4 trees; Each person planted 8 trees, with a difference of 18 trees. Q: How many students are there? How many saplings are there?
16, Robb formula dictation.
On a ship, there are three flags, red, yellow and blue. How many signals can * * * represent? List one by one.
18, there is a bucket of water. A cow should drink 15 days. If you drink from a horse, you can use 10 days. So how many days will it take if the horse drinks this bucket of water alone?
19, three empty bottles can be exchanged for 1 bottle. Xiaoming bought 22 bottles of wine. How many bottles can he drink?
38 students went boating. Each big ship can take six people, and the rent is 10 yuan. Each boat can take four people and rent 8 yuan. How are you going to accept it?
2 1, it is planned to take 30 days for the machinery factory to produce a batch of machines. In fact, 80 more machines were produced every day than originally planned, and the task was completed in 25 days. How many machines are there in this batch?
22. How many numbers in 1~200 are neither multiples of 5 nor multiples of 8?
23. After three years, the total age of the two brothers is 27 years old. This year, the younger brother's age is just the age difference between the two. Q: How old are my brother and younger brother this year?
Teacher Zhang said, "When I was your age, you were only seven years old. When you think of my age, I am already 37 years old. Do you know teacher Zhang's age?
25. There is a batch of goods that need to be loaded with 35 cars and 30 cars. Now we know that a big car is better than a small car.
They are all loaded with 3 tons more. Ask you: How many tons is this shipment?
26. There are 65,438+000 chickens and rabbits. A chicken has 80 more feet than a rabbit. How many chickens and rabbits are there?
27. A tree is eight meters high. A person climbs four meters every minute and drops three meters. How many minutes does it take him to reach the top of the tree?
Class A and Class B had a cross-country marching competition. Class A runs half the distance at a speed of 4.5 km/h and the other half at a speed of 5.5 km/h; During the competition, Class B travels at a speed of 4.5 km/h half the time and at a speed of 5.5 km/h the other half. Q: Who will win Class A or Class B?
28. It takes three days for the boat to travel from City A to City B and four days from City B to City A ... How many days does it take to put an unpowered raft from City A to City B?
29. Xiaohong and Xiao Qiang set out from home at the same time and walked in opposite directions. Xiaohong walks 52 meters per minute and Xiao Qiang walks 70 meters per minute. They meet on the way. If Xiaohong leaves four minutes early and the speed remains the same, and Xiao Qiang walks 90 meters every minute, then the two will still meet at point A. How many meters away is Xiaohong from Xiao Qiang's home?
30. Xiaoming and Xiaojun set out from A and B respectively at the same time and went in opposite directions. If two people go at the original speed, meet at 4 o'clock; If both are faster than the original speed 1 km/h, meet at 3 o'clock. How many kilometers is it between A and B?
3 1. Party A and Party B practice running along the 400-meter circular track, and both sides run in opposite directions from the same place on the track at the same time. After the encounter, the speed of A increased by 2m/s, and the speed of B decreased by 2m/s, so that they all returned to their original places within 24 seconds. Find the original velocity of a.
32. Two cars, A and B, were driving in opposite directions along the expressway from Station A and bilibili respectively. It is known that the speed of car A is 1.5 times that of car B, and the time for car A and car B to arrive at station C is 5: 00 and 16:00 respectively. What time did the two cars meet?
33. An express train and a local train go in the opposite direction. The length of the express train is 280 meters and the length of the local train is 385 meters. The time for people sitting on the express train to see the slow train pass is 1 1 sec, so how many seconds does it take for people sitting on the slow train to see the express train pass?
34. Party A and Party B practice running. If Party A lets Party B run 10 meter first, Party A can catch up with Party B after running for 5 seconds; If B runs 2 seconds ahead of A, A can catch up with B in 4 seconds. Q: How many meters do two people run per second?
35.A, B and C run from A to B at the same time. When a runs to b, b is 20 meters away from b and c is 40 meters away from b; When B ran to B, C was 24 meters away from B. Q:
(1) How many meters are there between A and B?
(2) If it takes 24 seconds for C to run from A to B, what is the speed of A?
36. On a road, Xiaoming and Xiaoguang ride bikes in the same direction. Xiaoming rides a bike three times as fast as Xiaoguang. Every 10 minute, a bus passes by Xiaoguang, and every 20 minutes, a bus passes by Xiaoming. It is known that a bus will leave the departure station at the same time every time. Q: What is the interval between two adjacent cars?