22.5 miles per hour.
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At 55 mph you are traveling 80.66 feet per second and after one hour at that speed you will have traveled 290,400 feet.
1 mile = 5,280 feet, so 70 miles per hour = 5,280 x 70 = 369,600 feet per hour 1 hour = 3,600 seconds, so 369,600 feet per hour = 369,600 / 3,600 = 102.667 feet per second.
14.66 feet per second.
A car driving 50 miles per hour travels 264,000 feet in one hour or 4,400 feet per minute or 73.3 feet per second. 50 x 5,280 feet (per mile)= 264,000 divided by 60 = 4,400 divided by 60 = 73.3
Feet per second x 0.68 = mph