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