0.51 kilometers/second (1 mile/1.609 kilometers)(3600 seconds/1 hour)
= 1141 miler per hour
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mph is speed and kilometer is distance. if you're saying kilometer per hour the answer is 80.47kph.
1 kilometer per hour = 0.621371192 mph
What is the approximate speed of light in kilometer per second?"
66 mph = 29.5 meters per second.
About 37.2 MPH