Here is the question.....Two boats are heading away from shore. Boat 1 heads due north at a speed of 3 m/s relative to the shore. Relative to Boat 1, Boat 2 is moving 40° north of east at a speed of 1.7 m/s. A passenger on Boat 2 walks due east across the deck at a speed of 1.1 m/s relative to Boat 2. What is the speed of the passenger relative to the shore? This is confusing me with the numerous relativities. I am using the equation V(13)= V(12)+V(23) where V(13) is the velocity of object 1 relative to object 3. Im not sure how to get this problem started. ??????