A new fitness tracker measures the number of calories burned by a person based on the duration of their workout. The table below shows the calories burned for different workout durations.
| Workout Duration (minutes), | Calories Burned, |
|---|---|
| 10 | 120 |
| 20 | 220 |
| 30 | 320 |
If the relationship between workout duration and calories burned is linear, what does the slope of the line represent in this context?
The initial number of calories burned before the workout starts.
The total calories burned after 30 minutes.
The number of calories burned per minute of workout.
The maximum calories that can be burned in a workout.
