Two small spherical metal balls, having equal masses, are made from materials of densities ρ1 and ρ2(ρ1 = 8ρ2) and have radii of 1mm and 2mm, respectively. They are made to fall vertically (fromrest) in a viscous medium whose coefficient of viscosity equals η and whose density is 0.1ρ2. The ratio of their terminal velocities  would be