What is the speed of a boy who runs a 100m race in a time of 4.5s?

To find the speed of the boy, you can use the formula for speed, which is distance divided by time. In this case, the distance is 100 meters and the time is 4.5 seconds. So, the speed is 100 meters / 4.5 seconds, which equals approximately 22.22 meters per second.