1. The problem statement, all variables and given/known data An airplane has a velocity relative to the air of 189 m/s in a westerly direction. If the wind has a speed relative to the ground of 50 m/s directed to the north, what is the speed of the plane relative to the ground? 2. Relevant equations I'm not entirely sure.. 3. The attempt at a solution I figured speed of plane relative to the ground = speed of plane relative to the air + speed of air relative to ground. So I put in x=189+50 Our homeworks are put online, and I already found out this answer was wrong. If anyone could help that'd be great! thanks!