$20\mathrm{.}0mL$ of Liquid A are poured into a beaker. $20\mathrm{.}0mL$ of Liquid $B$ are poured into another beaker. After $90$ minutes have passed, the volumes $V_A$ and $V_B$ of liquid in each beaker are$-$measured.

$20\mathrm{.}0mL$ each of Liquid A and Liquid $B$ are poured through a funnel, and the times $t_A$ and $t_B$ needed to pour each liquid through the funnel are measured.