lhecker007
09.09.2019 •
Mathematics
Woda płynąca z kranu a napełnia zbiornik w ciągu 6 h. by napełnić ten sam zbiornik woda płynącą tylko z kranu b potrzeba 9 h. ile czasu zajmie napełnienie zbiornika jeśli kran b odkręcono 4h po odkręceniu kranu a ?
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