Answer:
The first and second ones are correct
Explanation:
Since the formula for distance is rate * time, you can rearrange it to solve for speed so that rate is distance over time. In this problem, the distance is 2 1/2 miles nad the time is 1/6 of an hour, so you would have to divide the distance (2 1/2) by the time (1/6). The first one is correct as well since 5/2 is equal to 2 1/2.