1 kph = 0.000172603109 miles per second. So, kph x 0.000172603109 = miles per second. In this case: 100 x 0.000172603109 = 0.0172603109 miles per second.
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Conversion: miles per hour x 0.00044704 = km/sec
(P meter/second) x (1 kilometer/1,000 meters) x (3,600 second/hour) = 3.6 P kilometer/hour
80.0 (km per hour) = 0.0138082487 miles per second.
Miles per hour x 1.467 = feet per second.
I must assume that you typed your question carelessly, and that instead ofminute/second, you actually intended mile/second.(Q mile/second) x (0.62137 kilometer/mile) x (3,600 second/hour) = 2,236.94 Q kilometer/hour