3.5 (miles per second) = 20,277.73 km per hour.
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(35 mile/hour) x (1,609.344 meters/mile) / (3,600 second/hour) = 15.646 meter/sec (rounded)
51.33 feet per second at 35 miles per hour.
Its around 78 mi/hr.
(35 m3 per hour) / (3,600 seconds per hour) = 0.009722 m3 per second
At 25 miles per hour, a car travels: 36.67 feet per second.