Chemical Kinetics

For the reaction, \(3 \mathrm{I}_{(\mathrm{aq})}^{-}+\mathrm{S}_2 \mathrm{O}_{8(\mathrm{aq})}^{2-} \longrightarrow \mathrm{I}_{3(\mathrm{aq})}^{-}+2 \mathrm{SO}_{4(\mathrm{aq})}^{2-}\), rate of formation of \(\mathrm{SO}_4^{2-}\) is \(0.022 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{sec}^{-1}\). What is rate of formation of \(\mathrm{I}_{3(\mathrm{aq})}^{-}\) ?