Application of vector - answer checking

[Michael_Light]

Homework Statement

Two ships, A and B are sailing along straight routes with constant velocities. At 10 o clock morning, ship B is 8 nautical miles from A and its bearing from A is 315°. At 10.15 in the morning, ship B is 6 nautical miles from A and its bearing from A is 320°. Find the direction of velocity B relative to A.

Homework Equations

The Attempt at a Solution

My answer: W30.5°N, but answer given if E30.5°S, what answer do you guys get?

 

[HallsofIvy]

The given answer, E30.5S is correct. How did you get "W... S"?