Avogadro's law states that for a given temperature and pressure, the volume $V$ (in liters) and the number of moles $n$ of a gas are directly proportional, given by the equation $V=kn$, where $k>0$ is a constant. Suppose the volume of a gas is increasing at a rate of $0.3\text{ L/min}$ when the volume $V=5\text{ L}$ and the number of moles is $n=1\text{ mol}$. Determine the rate at which the number of moles is changing at this moment.