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doba to 24 h czyli 24 *60 minut = 1440 minut
270 : 1440 =27/144 =9/48 =3/16
Odp. 3/16
6h lekcyjnych to 45*6=270 min
1440 min. to doba
270/1440=27/144=3/16
odp:6h lekcyjnych to 3/16 doby.