I don’t know if this is correct, but this is how I did it:
15 divided by 2 is 7.5
This would mean she’s going 7.5 mph
Then you would divide 7.5 by 60 to convert to minutes, I got 0.125
You then transfer that to yards by multiplying 0.125 by 1760 to get 220 yards per minute.
Final answer: 220 yards per minute