Vom lucra in dm, pentru ca 1 dm³=1 litru
L=50 dm
=>Vol.cub=125000 dm³ sau litri
2 robinete _________ 20 l ___________ 1 sec
125000 l __________ x
x=125000:20=6250 sec
60 sec _______ 1 min
6250 sec ______ y min
y=104,1(6) min
60 min _______ 1 ora
104,1(6) min ___ x ore
z=1,736(1) ore