Since you have not included the graph, I will help you by explaining the detailed procedure to find the equation of the distance (d):
1) In the distance (d) in miles that an animal runs at a constant rate in (t) minutes, you have a set of order pairs (t, d), or even in a better case you have the line.
2) In any case, you can determine the slope of the line by dividing the rise by the run. This is the change in distance by the change in time:
slope = rise / run = change in d / change in t = distance / time
3) The slope is the velocity of the line is the velocity, that is:
velocity = distance / time = d / t = slope.
4) So, once you have the slope you can clear d:
d = slope × t
Now, just calculate the slope of the line of your graph and used replace it in the last formula, to find the answer.
