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: Stavba tunela skrátila trať z miesta a do miesta B na 3500 metrov. Koľko minút ušetria cestujúci, ak vlak chodí po trati rýchlosťou 120km/h a cez tunel rýchlosťou 150km/h? Vypočítaj dĺžku vetracích šácht, ak vieš, že sú rovnako dlhé
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