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Deschise simultan,trei robinete,cu avelasi debit,pot umple un bazin in 4 ore.In cate ore ar umple acelasi bazin un singur robinet ?

Răspuns :

3 robinete.......1 bazine in 4ore
1 robinet ..........1 bazin in X ore
3 robinete........1 bazin in 4 ore
1 robinet .........1 bazin in (4x3ore
1 robinet ..........1 bazin in 12 ore

R:12 ore
daca 3 robineti umple in 4h un bazin 
atunci 1 robinet va umple bazinul in:4x3=12 h(ore)