A horse power is a measure of power while miles per hour are a measure of speed. The two measure different things and, according to elementary principles of dimensional analysis, conversion from one to the other is not valid.
For example, consider the vehicles used at the Kennedy Space Centre had to move rockets to the launch area. To move that amount of mass the vehicles had massive power output - a very high value for horse power - but they moved at very low speeds.
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27 kilometers per hour = 16.7770222 mph
600 mph = 965.6064 kph.
845 miles per hour = 377.75 metres per second, approx.
30 km/h = 18.64 mph
6 feet per second is: 6 / 5280 = 0.0011363636 miles per second. So for miles per hour, multiply by 3600. This gives 4.1 miles per hour.