Two immersion heaters, A and B$,$ are both connected to a $120\mathrm{.}0-$V supply. Heater A can raise the temperature of $1\mathrm{.}00$ L of water from $20\mathrm{.}0$C to $90\mathrm{.}0$C in $5\mathrm{.}80$ min, whereas heater B can raise the temperature of $6\mathrm{.}80$L of water from $20\mathrm{.}0$C to $90\mathrm{.}0$C in $5\mathrm{.}00$ min. What is the ratio of the resistance of heater A to the resistance of heater B$?$