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25/2=12.5
Razem beda plewic 12,5 godziny.
Janek - 1/15
1/10 + 1/15 = 3/30 + 2/30 = 5/30 = 1/6
1cała : 1/6 = 6h
Odp.: Razem zajmie im to 6 godzin.