Aboeing 777 jet is flying due east at 550 mph (relative to the air). the air velocity is 80 mph in a direction 60 degrees east of north (relative to the ground). a passenger gets up from seat 23a on the north side of the airplane and walks directly across to seat 23j on the south side of the airplane at speed 3 mph (relative to the airplane). find the magnitude and direction of her velocity vector relative to the ground.