500 mL of 0.2 M MnO_4^- solution in basic medium when mixed with 500 mL of 1.5 M KI solution, oxidises iodide ions to liberate molecular iodine. This…

$\displaystyle 500$ mL of $\displaystyle 0.2 \mathrm{M} \mathrm{MnO}_4^{-}$solution in basic medium when mixed with $\displaystyle 500$ mL of $\displaystyle 1.5$ M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard $\displaystyle x$ M thiosulphate solution in presence of starch till the end point. If $\displaystyle 300$ mL of thiosulphate was consumed, then the value of $\displaystyle x$ is $\displaystyle \_\_\_\_$.