"To run 3 miles in less than 40 minutes."
Explanation:
Assuming this question was asked of you by K12 or Stride, this should be the answer because if the long term goal is to run 3 miles in 30 minutes, she would want to run 3 miles for an amount of time longer than 30 minutes and the only option listed that fits that said criteria, is 3 miles in less than 40 minutes. Hope this helps whoever searches this question; I noticed this question was posted almost a year ago...
