3.12: Quotient of ln and linear: rates of change

Find $\dfrac{\mathrm{d}y}{\mathrm{d}x}$.

Given that $x$ increases from $2$ to $2 + h$, where $h$ is small, find the approximate change in $y$.

Given that $y$ is decreasing by $0.4$ units per second, find the corresponding rate of change in $x$ when $x = 2$.