To find the distance of the swimming event, we can subtract the distance of the running event from the total distance of the race.
Total distance of the race = 7.13 miles Distance of the running event = 6.2 miles
Distance of the swimming event = Total distance - Running distance
Distance of the swimming event = 7.13 miles - 6.2 miles
Distance of the swimming event = 0.93 miles
So, the distance of the swimming event is 0.93 miles.