The zero order reaction

$A+2BC$

is carried out in a CSTR and in a PFR$.$ For an entering volumetric flowrate of $10d\frac{m^3}{s}$ at a concentration of $\mathrm{.}5mo\frac{l}{d}{m}^3,$ what is the space time for each reactor to achieve $90\%$ conversion.

Additional Information: $k_A=0\mathrm{.}01mo\frac{l}{d}{m}^3*s$