Answer:
The Jesse swim fastest
Explanation:
Given as :
The distance cover by Elizabeth while swimming = 50 feet
The time taken by Elizabeth = 10 sec
So, Speed of Elizabeth = 

∴ Speed of Elizabeth = 
 = 5 feet per sec
 = 5 feet per sec
Again , 
The distance cover by Jesse while swimming = 110 feet
The time taken by Jesse = 20 sec
So, Speed of Jesse = 

∴ Speed of Jesse = 
 = 5.5 feet per sec
 = 5.5 feet per sec 
Again , 
The distance cover by Reagan while swimming = 160 feet
The time taken by Reagan = 30 sec
So, Speed of Reagan = 

∴ Speed of Reagan = 
 = 5.3 feet per sec
 = 5.3 feet per sec 
So, 

Hence The Jesse swim fastest Answer