Daca primul robinet ar curge 4 ore si al doilea ar curge 12 ore, in bazin ar curge 272 hl de apa;
Dar, e stie ca in 4 ore prin primul robinet curge tot atata apa cat curge in 5 ore prin al doilea robinet => prin al doilea robinet curge 272:17 = 16 hl apa( transformi tu in l ); prin primul robinet curg (5x16)/4 = 20 hl apa( transformi tu in l);
Bafta!