To be accurate about it, the question has no answer, because 'km' is
a distance and 'mph' is a speed, so one can't convert to the other.
203 km is the same distance as about 126.138 miles (rounded). That
information may be somewhat helpful to you.
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28 kmh is 17.3984 mph
111.85 mph
74.5645431 mph
About 211.266 Mph.
There is no such thing as 20 mph acceleration. 20 mph is a velocity. Acceleration is expressed as velocity per unit time e.g. mph per second or mph per minute etc.