You cannot.
Mass per second square has dimensions [MT-2]
Kilometre per hour has dimensions [LT-1]
The two measures have different dimensions so conversion from one to the other is not valid.
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To convert mass per second square to kilometer per hour, you would need additional information such as the mass being referred to and the acceleration being measured. Simply knowing the unit "mass per second square" is not sufficient for conversion.
(P meter/second) x (1 kilometer/1,000 meters) x (3,600 second/hour) = 3.6 P kilometer/hour
Conversion: miles per hour x 0.00044704 = km/sec
I must assume that you typed your question carelessly, and that instead ofminute/second, you actually intended mile/second.(Q mile/second) x (0.62137 kilometer/mile) x (3,600 second/hour) = 2,236.94 Q kilometer/hour
300 kph = 83.3333333 meters / second ( 83 1/3 )
4.5 meters in 9 second how fast in kilometer per hour?