Converting 1% the speed of light to km/miles-per-second gives: 3000 km/s or 1860 miles/s. That's Paris to New York City in two seconds. I don't understand why

Converting 1% the speed of light to km/miles-per-second gives: 3000 km/s or 1860 miles/s. That's Paris to New York City in two seconds. I don't understand why they use distance-per-hour, either. It ends up being millions of miles/km, which no human has any sense of.