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------------------------------------------------ Teddy is cutting the grass on the school field.

The field is a rectangle measuring 100 meters long and 80 meters wide. He cuts [tex]$40 \, \text{m}^2$[/tex] of grass per minute. How many minutes will it take him to cut all the grass?

To find out how many minutes it will take Teddy to cut all the grass on the school field, we can follow these steps:

1. Determine the area of the field:
- The field is a rectangle with a length of 100 meters and a width of 80 meters.
- To find the area of a rectangle, multiply its length by its width.
- Area = Length × Width = 100 m × 80 m = 8000 square meters.

2. Understand Teddy's cutting rate:
- Teddy cuts 40 square meters of grass per minute.

3. Calculate the total time needed:
- To find out how long it will take to cut the entire area, divide the total area by the cutting rate.
- Time = Total Area / Cutting Rate = 8000 square meters / 40 square meters per minute = 200 minutes.

Therefore, it will take Teddy 200 minutes to cut all the grass on the field.