60 mile/hour x 5280 ft/1 mi x 1hour/3600 seconds = 88 ft/second
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100 miles per hour = 100*1.609344 kilometres per hour = 160.9344 kilometres per hour = 160.9344/3600 kilometres per second = 0.0447 km per sec (approx).
Miles per hour Kilometer per hour Ft per sec
(mph x 1.466 = feet per second). So, 70 mph x 1.466 = 102.62 feet per second.
100 meters in 12 seconds is 18.64 miles per hour.
Use the units to help figure this out. There are 5280 feet per mile = 5280 ft / 1 mile There are 3600 seconds in an hour = 3600 sec / 1 hour 80 Miles / 1 hour = 422400 ft / 1 hour = 422400 ft / 3600 Sec = 117.3333 ft / sec