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