Hi you can take Airport line 5, it can take you to the airport from the railway station. It runs every 15 minutes and i think you can catch the one leaves at 10:00. Then it needs about 1 hour and 20 minutes to the airport. So when you get to the airport, it is already 11:30. If you are lucky, you can catch the flight narrowly. But i think you'd better make another plan as the time is too tight. Generally international tpassengers should be 2 hours ahead of the departure time.