What is Stacey's speed if she goes 40.5m in 5.6s?

Speed is defined as the distance traveled in unit time or distance traveled divided by the total time of travel.

speed = 40.5 metres / 5.6 seconds = 7.23 meters / second

that means that Stacey moves 7.23 meters in each second.

Speed = (distance covered) / (time to cover the distance).

Her speed is exactly 40.5 meters per 5.6 seconds.

In more familiar units, (40.5/5.6) = 7.232 meters per second (rounded)