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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?

Răspuns :

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