You just finished a triathlon in a spectacular  2
 hours, and you want to know how fast you swam. The race consists of 
1
 mile of swimming, 
12
 miles of bicycling, and 
3
 miles of running. You know that you biked for 
1
 hour and you ran at a speed of 
5
 miles per hour. How many miles per hour did you swim? Your answer should be a number only, rounded to the nearest tenth, without units.