1. A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?

Average speed is calculated by dividing the distance traveled by the time taken. In this case, the distance traveled is 100 meters and the time taken is 10 seconds.

Average speed = distance / time
Average speed = 100 meters / 10 seconds
Average speed = 10 meters per second

Therefore, the runner's average speed is 10 meters per second.