40 km/hour = 25 mph
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320 km per hour equals 198.83 miles per hour.
40km * 60 seconds = 2400 KPH. 2400km * 60 minutes = 144000 KPH.
About 22.9 miles per hour.
666.67 seconds
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.