Two rods with the same dimensions have thermal conductivities in the ratio 1:2. They are arranged between heat reservoirs with the same temperature difference, in two different configurations A and B. The rates of heat flow in A and B are ${\mathrm{I}}_{\mathrm{A}}\mathrm{and}{\mathrm{I}}_{\mathrm{B}}$respectively. The ratio $\frac{{\mathrm{I}}_{\mathrm{A}}}{{\mathrm{I}}_{\mathrm{B}}}$is equal to