(90 mile/hour) x (1.609344 kilometer/mile) x (1 hour/3,600 sec) = 0.04023 km/sec (rounded)
40.234 meters per second (rounded)
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63 miles per second = 365,000 kilometers per hour.
55 kilometers an hour=34.1754156 miles per hour
About 62 miles.
14 kilometers = 8.6992 miles (rounded)
3 km per hour = 1.86 miles per hour = 1.86/60 = 0.031 miles per minute = 0.031/60 = 5.2*10-4 miles per second.