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60:3=20
60:100x0,15=0,60x0,15=0,09
57/60
39/60
18/60 :)
1/3 h = 1/3 x 60 = 20 min
0,15 h = 15/100 x 60 = 9 min
57 min = 57/60 = 19/20 h
39 min = 39/60 = 13/20 h
18 min = 18/60 = 6/20 =3/10 h
liczę na naj :)