To find how many minutes and seconds Leif ran, you will start with Sawyer and perform each operation in the order it states in the problem.
1. Sawyer ran for 27 minutes and 30 seconds.
2. Carson ran for 14 min, 20 sec + 27 mins, 30 secs or 41 min, 50 sec
3. Leif ran 41 min. 50 sec - 8 min, 45 sec = 33 mins, 5 sec
Leif ran for 33 minutes and 5 seconds.