Serra rode 15 mi in 1.5 hr. phaelon rode 38 mi in 3.5 h. justice rode 22 mi in 2.25 hr. who had the fastest average speed?

Speed = distance / time

Serra : 15/1.5 = 10 miles per hr
Phaelon : 38/3.5 = 10.857 rounds to 10.86 miles per hr
Justice : 22/2.25 = 9.777 rounds to 9.8 miles per hr

fastest average speed is Phaelon