Here's what that means:

* Direct Proportionality: If you increase the distance traveled, you also increase the speed, assuming the time stays the same. For example, if you travel 10 miles in 1 hour, you're going 10 mph. If you travel 20 miles in 1 hour, you're going 20 mph.

* Inverse Proportionality: If you increase the time it takes to travel a certain distance, you decrease the speed. For example, if you travel 10 miles in 1 hour, you're going 10 mph. If you travel the same 10 miles in 2 hours, you're only going 5 mph.

Formula:

The relationship between speed, distance, and time is represented by the following formula:

Speed = Distance / Time

This formula highlights the direct proportionality between speed and distance and the inverse proportionality between speed and time.