Here's why:

* Speed is the rate at which an object changes its position. It's calculated as distance traveled divided by the time taken.

* Average speed considers the total distance traveled and the total time taken, regardless of any changes in speed during that time.

Example:

If you drive 100 miles in 2 hours, your average speed is 50 miles per hour.

However, you might have driven at 60 mph for the first hour and 40 mph for the second hour. Your average speed is still 50 mph because it considers the total distance and time.

Let me know if you have any other questions!