To study the photochemical decomposition of aqueous bromine exposed to bright sunlight, we dissolved a small amount of liquid bromine in water contained in a glass jar and placed under direct sunlight. The following data were obtained at $25\backslash$deg C:$\backslash$table$[[$Tiempo $($min$),10,20,30,40,50,60],[Pp{m}_2,2\mathrm{.}45,1\mathrm{.}74,1\mathrm{.}23,0\mathrm{.}88,0\mathrm{.}62,0\mathrm{.}44]]$ Determine the reaction rate order and the specific reaction rate constant:

a$)$ Differential method $($The method for obtaining the derivatives is left to your decision$)$