It means a distance of 760 miles is traveled every hour.
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The speed of sound is around 760 miles per hour = Mach 1. So Mach 4 is 4*760 = 3040 mph.
It means how many miles an object has travelled per every hour
it means if you go about 60 miles per hour for an hour youll move 60 miles away from where you started
About 55 miles per hour.
24.85 miles per hour