7. A GPS tracking device is placed in a police dog to monitor its whereabouts relative to the police station. At time = 23 min, the dog's displacement from the station is 1.2 km, 33 north of east. At time 257 min, the dog's displacement from the station is 2.0 km, 75 north of east. Find the magnitude and direction of the dog's average velocity between these two times.