The conversion values obtained for the $2A3$A liquid phase reaction performed at different feed rates in an ideal CSTR tank type reactor versus the residence time in the reactor are given in the table below. The initial concentration of substance A is $25mo\frac{l}{m}3.$ What should be the residence time in the piston flow reactor for the A concentration to decrease from $25mo\frac{l}{m}3$ to $10mo\frac{l}{m}3$ for the same reaction?

$\backslash$table$[[t($second$),0\mathrm{.}55,7\mathrm{.}14,16\mathrm{.}6,50,150,400],[x,0\mathrm{.}01,0\mathrm{.}1,0\mathrm{.}2,0\mathrm{.}4,0\mathrm{.}6,0\mathrm{.}8]]$