An airplane flies a straight course due east from city M to city N, 644km away. The plane has an airspeed of 290 km/h. (Airspeed is the speed of the plane relative to the moving air. ) A crosswind blows due south at 97km/h. In what direction must the plane be headed, and how long will the trip take in hours? Write the necessary vector equation using subscrips P for plane and A for air. Lay out the vectors using a scale of 1mm=4km/h and scale off results.