Formula=miles 10 hrs=3.000000000seconds
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Use this formula: feet per second x 0.6818 = miles per hour:325 ft/sec x 0.6818 = about 221.6 miles per hour
km/sec x 2,236.94 = mph
Use this formula: mph x 0.447 = meters per second
Miles per hour x 1.467 = feet per second.
Formula: feet per second x 0.681879 = mph30 feet per second x 0.681879 = 20.45637 mph