It would take 12 minutes to drive 20 miles at 100 mph.
20
10.5 minutes.
20 mph = 20 miles in one hour so half of that is the answer 10 miles in half an hour = 30 minutes
51 minutes
20 minutes @65 mph
20 minutes
17 hours, 20 minutes at 75 mph
1 hour, 40 minutes at 12 mph
227 miles at 20 mph = 11.35 hours or 11 hours 21 minutes.
It is: 20/15 = 1 hour and 20 minutes
80/20 = 4 hours