Well, there are 5280 feet in a mile and 3600 seconds in a hour.
So, 5280 feet times 45 miles equals 237600 feet.
Then you divide 237600 feet by 3600 seconds, to get 66 feet per second.
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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