73.33 feet per second.
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Feet sec. or per minute? Need more info to answer.
60 mph = 88 fps (exactly)
Use this formula: feet per second x 0.6818 = miles per hour:325 ft/sec x 0.6818 = about 221.6 miles per hour
There are 5,280 feet per mile and 3,600 seconds per hour. Therefore, 5280 X 240 = 1,267,200 feet and 1,267,200/3,600 = 352 feet per second.
Conversion: miles per hour x 0.00044704 = km/sec