Speed is distance travelled in a given time, so speed = distance / time.
40mph = 40 miles / 1 hour
each mile has 1760 yards, each of 3 feet, so there are 3x1760 = 5280ft in each mile, so 40 miles = 40x5280ft.
Each hour has 60 minutes and each minutes has 60 seconds, so 1 hour = 60x60 = 3600 seconds
So 40mph = 40miles/1hour = 40x5280ft/3600secs = 58.67fts-1
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15 mph = 22 feet per second
146.6 feet per second.
14.66 feet per second.
3,000 feet per second = 2,045.45 mph
44 feet per second = 30 mph