10.
Mr. X starts marathon running from point A. He runs 5 km towards north to reach point B, then takes a right turn and runs 6 km to reach point C, again takes a right turn and runs 8 km to reach point D, then turns right and runs 10 km to reach point E, then take a right turn and runs 6 km to reach point F, then takes a right turn and runs 1 km to reach point G, then takes a right turn and runs 3 km to reach point H. At point H, Mr. X is facing which direction?