Answer:
Kiara math fact completion rate is 5
Explanation:
The data is as follows 
Giovanni 
Seconds 
Math Facts 
from this data we can conclude 
Giovanni solves = 20/4 = 5math facts per second
Kiara = 5t , where t represents time in seconds 
 for 1 second Kiara rate will be = 5*1 math fact per second 
 = 5 math facts per second