Two vehicles leave simultaneously from a fork in a road. Vehicle A travels at a velocity of 85 km/h north-east. Vehicle B travels at 104 km/h directly east. Calculate the velocity of vehicle A relative to the velocity of vehicle B. Answer (from memorandum): http://imgur.com/a/L0prH I do not understand why is Vehicle B traveling west, an explanation on how why this was done would be appreciated! aVb = Va - Vb (Velocity of A relative to velocity of B) when do you use this equation?