Dobrý deň.Prosím,nevie niekto ako to mám vypočítať? Môj výsledok neni ani v možnostiach
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Ak by som knihu čítala pol hodiny denne,Dočítala by som ju za 9dni.Knihu ale musím vrátiť o tri dni skor.Koľko min. denne musím citát knihu,aby som ju prečítanú vratila v stanovenom case?
A ešte tuto neviem:
Nádrž tvaru kvádra má dĺžku 2,5m,šírku 100cm a vyšku 12dm.Za koľko min sa naplní vodou do dvoch tretín,ak do nádrže priteká 40l vody za minútu?
Vopreď ďakujem veľmi pekne.
Pekný deň.
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