The conductivity of centimolar solution of $\mathrm{KCl}$ at $25^{\circ} \mathrm{C}$ is $0.0210 ~\mathrm{ohm}^{-1} \mathrm{~cm}^{-1}$ and the resistance of the cell containing the solution at $25^{\circ} \mathrm{C}$ is $60 ~\mathrm{ohm}$. The value of cell constant is -