The reaction $\mathrm{A}\left(\mathrm{g}\right)+2\mathrm{B}\left(\mathrm{g}\right)\to \mathrm{C}\left(\mathrm{g}\right)+\mathrm{D}\left(\mathrm{g}\right)$is an elementary process. In an experiment involving this reaction, the initial partial pressures of A and B are ${\mathrm{p}}_{\mathrm{A}}=0.60$and ${\mathrm{p}}_{\mathrm{B}}=0.80$atm respectively. When ${\mathrm{p}}_{\mathrm{C}}=0.20$atm, the rate of the reaction relative to the initial rate is