want to take the train G 7146 at 21:15 from shanghai to nanjing,

my flight arrives at pudong airport at 6:40pm, and like to take the subway line 2 to hongqiao and take the train at 21:15, do you think if i have enough time to do that? my return flight is 10am, i like to take the early train from nanjing to shanghai, what's your suggestion?