While chasing Hritik in Dhoom 2 abhishek take a helicoptor. from jail at point A. The speed of helicopter is 50km/hr during take off of 6 min. during chase it was moving at constant speed of 60km/hr for 30 min after which abhishek lost hritik. If abhishek returned to A and parked the helicopter at the same point as take off. what is the displacement of the helicopter.