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4 mph. Remember Speed = distance(miles) / time(hours) 15 minutes = 1/4 hours. Susbtituting speed = 1mile/ (1/4 hours) (Division of fractions). speed = 1 miles X 4/1 per hours speed = 4 mph.
Speed = distance/time => Speed = 20m / 5s => Speed = 4 m/s or 4 ms-1
The speed of sound is around 760 miles per hour = Mach 1. So Mach 4 is 4*760 = 3040 mph.
200/4 = 50 miles per hour
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