The rms velocity of Nitrogen molecule in a cylinder containing Nitrogen gas at 17⁰C is 5×10¹² m/s. If the diameter of the Nitrogen molecule is roughly 2.0 $\stackrel{0}{\mathrm{A}}$ and no. of molecules per unit volume is  2.56×10²⁵ ${\mathrm{m}}^{-3}$. Then the time taken for the collision between two Nitrogen molecules