Two ships leave port simultaneously. Ship A sails north-west at 30 km/h and ship B sails S 40 degrees W at 30 km/h. Calculate the velocity of ship B relative to the velocity of ship A.

Answer 1

You add them as vectors.

Vbreltoa=velocityb-veloictya AS VECTORS

Answer 2

A = (-21.2,21.2)
B = (-19.3,-23.0)

B-A = (1.9,-44.2)
= 44.2,-87.5° or 44.2km/hr S2.5°E