2. An activity field is rectangular, 60 meters long and 28 meters wide. Plan to plant a tree every 4 meters around. So, how many trees can a * * * plant?

3. A rectangular meadow, 48 meters long and 30 meters wide, surrounded by trees on both sides of the 6-meter-wide walkway, ensures that there is a tree in each corner with equal spacing. How many trees should be planted at least?

4. There is 103 telephone pole on one side of the road, and the distance between two adjacent telephone poles is 40m. Now it is planned to replace all of them with large cement poles, with two adjacent poles 60 meters apart. How many large cement poles are needed?

5. A square pool with 12 trees on each side, and the distance between two adjacent trees is 4m. How many meters are there around this pool?

6. Plant trees beside a rectangular pond with a length of12m and a width of 9m, and plant trees every 3m. * * How many trees are planted around?

7. A greening team plans to plant trees on the levee of 1600 meters long, and plant a tree every 4 meters. How many trees should be prepared?

8. The lake is 3600 meters long, and a poplar is planted every 3 meters. * * * How many poplars can you grow?

9. It is planned to install 16 billboards on the railings on both sides of a bridge with a length of130m. The horizontal length of the billboard is 1 m, and the distance between the two ends of the bridge is12m. What is the distance between two adjacent billboards?

10. There are 30/kloc-0 poles between Party A and Party B, and the distance between every two adjacent poles is 50m. Later, the line was rebuilt, and the old pole was removed and replaced with a new pole of 20/kloc-0. So, how far is the distance between every two poles after modification?