1. A car traveling at 60 miles per hour (mph) on a highway. This is a common example of speed as it is a measure of how fast the car is moving.

2. A runner completing a 100-meter sprint in 10 seconds. This is a specific example of speed that is used to measure athletic performance. The runner's speed is calculated by dividing the distance (100 meters) by the time (10 seconds) to get 10 meters per second.

3. A bullet fired from a gun at 1,000 meters per second. This example shows a very high speed, and it is important in the context of projectile motion and weaponry.

These examples show how speed can be measured and used in different situations.