35 cm=3,5 dm
28 cm=2,8 dm
15 cm=1,5 dm
V=3,5x2,8x1,5=14,70 dm³ =14,7 litri
1l=100 cl
14,7 l = 1470 cl
12 picaturi 1 cl
12x6=72 sec
1 cl ....72 sec
1470 cl....x sec
1470 x72 =105840 sec
105840 : 3600 sec/ora=29 ore si rest 1440 sec
1440 : 60 sec/min = 24 min
vasul se va umple in 29 ore si 24 min