The diffusion coefficient of $Ti$ is $2\mathrm{.}0{10}^{-5}c{m}^2{s}^{-1}$ and that for $C{d}^{2+}$ is $0\mathrm{.}72{10}^{-5}c{m}^2{s}^{-1}.$ If a $1mM$ solution of $C{d}^{2+}$ gives a diffusion current of $8\mathrm{.}15A,$ what will be the diffusion current for a $1mM$ solution of $T{i}^{+}$using the same polarographic cell?