Răspuns :
2 robinete ...........10 ore
1 robinet..............20 ore
1 robinet...............18 ore si 120 minute
6 robinete.............x ore
x=18 ore 120 minute : 6
x= 3 ore si 20 minute
2 robinete ...........10 ore
1 robinet..............20 ore
1 robinet...............18 ore si 120 minute
6 robinete.............x ore
x=18 ore 120 minute : 6
x= 3 ore si 20 minute