Mustang Isabella Mack finished the Dell Rapids Invite with a time of 27:15.29. (Photo/Sara Stadem) Matt Larson | Big Sioux Media Isabella Mack and Teagin Gacke traveled to Dell Rapids for a cross country meet on Monday, September 18. Mack and Gacke were the only two varsity runners for the Mustang team at the event.Mack…