A cube (side `=10 cm`) of density `0.5 g//cm^(3)` is placed in a vessel of base area `20 cmxx20 cm`. A liquid of density `1.0 g/ cm^(2)` is gradually filled in the vessel at a constant rate `Q=50 cm^(3)//s`
The cube will leave contact with the vessel after time t= ......... s.
A. 30
B. 40
C. 60
D. 20