Physics Question from JEE Main 2023 · 1 February, Shift 2

The surface of water in a water tank of cross section area $750 \, \text{cm}^2$ on the top of a house is $h \, \text{m}$ above the tap level. The speed of water coming out through the tap of cross section area $500 \, \text{mm}^2$ is $30 \, \text{cm/s}$. At that instant, $\frac{dh}{dt}$ is $x \times 10^{-3} \, \text{m/s}$. The value of $x$ will be _____.