It’s probably most definitely the third one but I really don’t know.
2miles=20km
20km/4=5km
5km=0,5mile
Runned 0.5 miles in total
ANSWER

EXPLANATION
The given function is a piecewise defined function.

is the y-value that corresponds to

To determine that y-value, we need to trace from

to where it meets the graph.
We then trace to the y-axis to determine the corresponding y-value as shown in the diagram.
From the graph, we can see that this x-value corresponds to a y-value of

This implies that, when

Therefore

See graph.
You have to move the decimal