Solve the Problem $135 \mathrm{~km} / \mathrm{hr}$ a Second Airplane Approaches from the East At from the North

Solve the problem.
-One airplane is approaching an airport from the north at $135 \mathrm{~km} / \mathrm{hr}$ . A second airplane approaches from the east at $201 \mathrm{~km} / \mathrm{hr}$ . Find the rate at which the distance between the planes changes when the southbound plane is $33 \mathrm{~km}$ away from the airport and the westbound plane is $21 \mathrm{~km}$ from the airport.

A) $222 \mathrm{~km} / \mathrm{hr}$
B) $108 \mathrm{~km} / \mathrm{hr}$
C) $808 \mathrm{~km} / \mathrm{hr}$
D) $711 \mathrm{~km} / \mathrm{hr}$