Question 1081664
This really needs a figure, which I do not show here.  There will be two triangles, sharing a diagonal.  The top segment and bottom segment of the combined figure are parallel.  Endpoints of the bottom segment are boats A and B.  Endpoints of the top segment mark the places where angles of depression were measured.  Time for movement given for that segment of distance was 10 seconds.  


The distance in feet traveled during those 10 seconds was...

{{{4500((sin(95))(sin(10)))/((sin(60))(sin(145)))}}}


Not a complete solution; only the distance traveled in the 10 seconds time interval.