Answer:
Part A) 2 miles
Part B) 1/2 hour
Part C) The model in the attached figure
Explanation:
Let
x -----> the number of miles
y -----> the time in hours
we know that

so
-----> equation A
Part A) Find out how many miles she hikes in one hour
so
For y=1 hour
substitute in the equation A and solve for x
Part B) Find out how much time it takes her to hike 1 mile
so
For x=1 mile
substitute in the equation A and solve for y

Part C) Draw a model
The double number line in the attached figure