#### Problem 37E

37. Boyle’s Law states that when a sample of gas is compressed at a constant temperature, the pressure $P$ and volume $V$ satisfy the equation $P V=C$, where $C$ is a constant. Suppose that at a certain instant the volume is $600 \mathrm{~cm}^{3}$, the pressure is $150 \mathrm{kPa}$, and the pressure is increasing at a rate of $20 \mathrm{kPa} / \mathrm{min}$. At what rate is the volume decreasing at this instant?