3.36: Ln quotient: derivative and rates

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

Given that $x$ increases from $1$ to $1 + h$, where $h$ is small, find the approximate corresponding change in $y$.

When $x = 1$, the rate of change in $y$ is $3$ units per second. Find the corresponding rate of change in $x$.