Despre doua robinete stim ca primul umple singur un bazin in 3 ore, iar al doilea umple singur acelasi bazin in 6 ore. In cate ore cele doua robinete curgand impreuna pot umple bazinul?
primul robinet umple in 6ore 2 bazine al 2-lea robinet umple in 6ore 1 bazine deci ambele pot umple in 6 ore 1+2=3 bazine deci ambele vor umple un bazin in 6:3= 2ore
