Jones ran a 12-mile race at an average speed of 8 miles per hour. If Brown ran the same race at an average speed of 6 miles per hour, how many minutes longer than Jones did Brown take to complete the race?
A. 9
B. 12
C. 16
D. 30
Use the formula for distance: Distance = Rate × Time.
Jones runs 12 miles at 8 miles per hour, which means that he runs for 1.5 hours. Brown runs the same 12 miles at 6 miles per hour, which means that he runs for 2 hours. Brown takes half an hour longer to complete the race. Half an hour is 30 minutes.