2. There are 402 students in the fourth grade of the experimental primary school, with an average of two teams queuing to visit the Hubei-Huang Yangtze River Bridge. If the average distance between the students in front and the students behind is 60 cm, how long is the team?
There is an annular flower bed at the junction of Mingzhu Avenue and Bridge. Perimeter of flower bed150m. Plant a tree every 3 meters in the flower bed circle. How many trees have been planted?
4. Plant trees around a square pool, with one tree at each of the four vertices, so that there are 25 trees on each side, and the distance between every two trees is10m. How many meters is the * * * around this pool?
5. Plant evergreen trees around a square pool, one tree at each of the four vertices, 14 trees on each side, and three young trees between every two trees. * * How many evergreen trees are planted around? How many saplings?
6. Father and son competed to climb the stairs. When the father climbed to the fifth floor, the son climbed to the third floor. If the son climbed to the fifth floor, how many floors did the father climb?
7. An old man walked on the highway at a constant speed after dinner. It took him nine minutes to walk from the first telephone pole to the 10 pole, so he kept walking for 1 hour, just as long as he came back. What telephone pole did the old man walk to before coming back?
8. A rectangular nursery, 460 meters long and 300 meters wide, is surrounded by a Ligustrum lucidum tree every 5 meters. How many trees should be planted in a * * *?
9. The original 8 1 poles are on both sides of Chibi Avenue, and the distance between every two poles is 30m. Change to another model first, and every two poles are 50m apart. How many such poles do both sides need?
10. There is a flower bed, which is a big triangle composed of four identical small triangles. There are 10 flowers on the side of each small triangle. How many flowers are planted in the big triangle a week? How many trees are planted in a * * *?
1 1. Arrange 8-corner stamps on a square piece of paper, and the number of stamps on each side is equal. These stamps are worth 19 yuan 20 cents. Please count the number of stamps on each side.
12. There is a clock, which rings once and the continuous sound lasts for 3 seconds. If it rings six times, it takes 43 seconds for a * * *. Now when it rings 12, a * * *, how long will it take?
13. Two greening teams, A and B, plant trees on both sides of a 3 km expressway, plant a camphor tree every 20 meters, and plant a plane tree in the middle of adjacent camphor trees. Team A has more trees than Team B 12. How many trees did Team A and Team B plant respectively?
14. On a bridge, there are 20 billboards on both sides, each 3 meters long and 2 meters wide. The distance between the two billboards is 8 meters, and the billboards near both ends of the bridge are 50 meters away from both ends of the bridge. How long is this bridge?
15. A large-scale armed police parade in a city, there were 20 phalanxes in front of a rostrum, and 50 police cars passed by. Each police car is 4 meters long and the distance between police cars is 5 meters. Each phalanx is10m long, every two phalanxes are separated by 3m, and the phalanx is separated from the police car by 8m. How long is this team?