To determine the final displacement of the car, we need to consider both the distance traveled and the direction. In this case, the car initially travels 110 km to the north and then turns around and travels 80 km to the south.
Since the car traveled to the north and then returned by traveling to the south, we can subtract the distance traveled to the south from the distance traveled to the north to find the net displacement.
110 km (north) - 80 km (south) = 30 km (north)
Therefore, the final displacement of the car is 30 km to the north.