Answer:
12.5 m/s
Step-by-step explanation:
To find the average speed of a runner, you need to divide the total distance traveled by the time it took to travel that distance. In this case, the runner covered a distance of 100 meters in 8 seconds, so the average speed can be calculated as follows:
Speed = Distance / Time
Speed = 100 meters / 8 seconds
Speed = 12.5 meters per second
So the runner's average speed is 12.5 meters per second, or equivalently, 45 km/h.