Answer:
10 m/s
Explanation:
The phrase "how fast she is going" tells us that we need to find her speed.
To find her speed, we need to take her distance (50 meters) and divide it by the time (5 seconds):
Runner's Speed = Distance ÷ Time
Runner's Speed = 50 ÷ 5
Runner's Speed = 10 m/s
Hence, the girl's speed is 10 m/s