1. There is a rectangular wheat field, which is 200 meters long and 50 meters wide. How many hectares is this wheat field?

2. A forest belt of 15km and 8m wide was planted along the river in a township. If 2000 trees are planted per hectare, how many trees will be planted in this forest belt?

3. A rectangular botanical garden covering an area of 6 hectares and 200 meters wide. How long is it?

A grain expert collected 72,000 kilograms of wheat in a field 400 meters long and 300 meters wide. What is the average yield per hectare?