Answer:
4.5km/h
Step-by-step explanation:
Here we know that she does 9 km per 2 hours. If we know how much she can travel in 2 hours it's very easy to find out how much she travels in 1. Because half of 2 hours is one hour. So we can simply half 9 km to find how much she travels in 1 hour:
9/2 = 4.5
4.5km/h
I hope this makes sense :)
