21 miles is exactly 21 miles long or if you prefer 36960 yards long. 21 miles is also 110880 feet long and 1,330,560 inches long.
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mph means Miles Per Hour, so 21 miles takes 21/60=.35 hour. Then .35 hour is equal to .35*60=21 minutes. So the final answer is 21 minutes
13hours 40minutes
Approximately 21 minutes.
distance = rate * time 7 miles = 20 mph * t t = 7 miles / 20 mph = .35 hours = 21 minutes
5 hours 21 minutes at a constant 70 mph, excluding stops.