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marta :
4km:16km /h = 4/16 h = 1/4h = 15 min
jacek:
4km:20km /h = 4/20 h = 1/5 h = 1/5* 60 min = 12 min
odpowiedz :
Jacek wyjechal 3 min pozniej od Marty czyli o 14.03