Please have explanations next to the steps. Thanks! As I worked on this, the answer is not -5.6 nor does 16 mph changes to -16 mph.

Please have explanations next to the steps. Thanks! As I worked on this, the answer is not -5.6 nor does 16 mph changes to -16 mph.

A ship A is 32 miles north of ship b and is sailing due south at 16 mph. Ship B is sailing due east at 12 mph. At what rate is the distance between them changing after 1 hour has passed?