Problem 16E

(a) What quantities are given in the problem?

(b) What is the unknown?

(c) Draw a picture of the situation for any time $t$.

(d) Write an equation that relates the quantities.

(e) Finish solving the problem.

16. At noon, ship $A$ is $150 \mathrm{~km}$ west of ship $\mathrm{B}$. Ship $\mathrm{A}$ is sailing east at $35 \mathrm{~km} / \mathrm{h}$ and ship $\mathrm{B}$ is sailing north at $25 \mathrm{~km} / \mathrm{h}$. How fast is the distance between the ships changing at $4: 00$ PM?