A man of mass 60 kg is standing on a stationary boat of mass 240 kg. The man is carrying a sphere of mass 0.5 kg in his hands. If the man throws the sphere horizontally with a velocity of $12 {\mathrm{ms}}^{-1}$, the velocity with which the boat will move (in magnitude) is ___$\times {10}^{-2} \mathrm{m}/\mathrm{s}$