Un robinet umple un bazin in 3 ore , iar un alt robinet umple acelasi bazin in 4 ore. Determinati intervalul de timp in care cele doua robinete curgand impreuna vor umple bazin .

Răspuns :

primul robinet umple 4 bazine in 12 ore
al doilea robinet umple 3 bazine in 12 ore
impreuna 4+3=7 bazine in 12 ore
12:7=1.7142857142857142857142857142857
60*0.7142857142857142857142857142857=~42.8571
cele doua robinete vor umple bazinul in aproximativ 1 ora si 43 minute