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x km/h = 225min
225x=60*255
225x=15300
x=68
Pan Zenek jechał z prędkością 68km/h
4h 15 min= 4,25
4h 15min-30min= 3h 45min
3h 45min=3,75
60-4,25
x-3,75
4,25x=60 razy 3,75
4,25x=225
x= ok.53 km/h