To find the velocity of A relative to B based on the velocities of A and B relative to a third object O,[br][br]Take [math]\vec{v}_{AB}=\vec{v}_{AO}-\vec{v}_{BO}[/math]
A plane is observed by a person stationary to the ground to travel at a speed of 4 units to the east.[br][br]The wind is moving at a speed of 3 units to the north.[br][br]What is the speed of the plane relative to the wind?