I think you mean 7500 LINEAR feet per second.
The answer is 5110 mph
7500 feet x 60sec= 450,000 feet per minute (FPM)
450,000 FPM / 5280 feet (in a mile) = 85 miles per minute (MPM)
85 MPM x 60 Minutes (1 hour) = 5110 MPH approx.
((7500x60)x60) divided by 5280= 5100 mph
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