Nothing.
A centimetre is a measure of distance. A mile per hour is a measure of speed.
The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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There are 1.609344 kilometres in one mile. Therefore, 500 miles per hour is equal to 500 x 1.609344 = 804.672 kilometres per hour.
1 mile per hour equals 44.7 centimeters per second.
750
500 ft / 60 seconds = 500 ft/minute = 500*60 = 30,000 feet per hour = 30,000/5280 miles per hour = 5.68 mph (approx).
Divide the distance (2750) by the average speed per hour (500) to get the answer. When you solve the problem, the answer comes to 5.5 hours.