Well, since there are 5,280 feet in a mile and 60 minutes in an hour, we will need these numbers. If we multiply 777 (feet) times 60 (minutes in one hour), we find that we will travel 46,620 feet in one hour. If we divide 46,620 by 5,280 we get 8.83. This is how fast we are going. 8.83 miles per hour.
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40 mph = 0.67mpmin = 3520ft/min
270 feet/10.8 min = 0.284 mph (approx).
1 mph = 5280 ft/hr = 5280 ft / 60 min = 88 ft/min
1 mile = 1760 yards , 1 yard = 3 feet , 1 hour = 60 mins 60 miles per hour = 60 * 1760 * 3 / 60 feet per min therefore, after cancelling, 60 mph = 1760 * 3 ft / min = 5280 ft / min .
60 mph = 88 feet per second 70 mph/60 mph x 88 = 102.6 feet per second or multiply mph x about 1.46