I need to travel from Charles de Gaulle airport to Montparnasse to catch a TGV (Train à Grande Vitesse or "high-speed train"). What is the best and fastest method to do that? Train?
I only have an hour and 30 minutes between arrival at CDG and the pre-booked TGV departure from Montparnasse (I didn't do the booking myself). I am concerned that may not be enough time.