airports A and B are such that AB=(600i+200j)km.an aircraft

airports A and B are such that AB=(600i+200j)km.an aircraft is to be flown directly from A to B.the aircraft can maintain a steady speed of 390kmh in still air.there is a wind blowing with velocity (30i-20j)kmh.find,in the form ai+bj,the velocity vector the pilot should set so that this velocity.together with the wind,causes the plane to travel directly from A to B