Train Times and can we change one if we arrive later

Dear Sirs

We would like to book a ticket from Shanghai to Nanjing. We will be flying into Shanghai at 09:35am on Friday, but I do not know what exact time to book. If I book one, and we are late, can we catch the next one with the same ticket? Or will we loose our booking and have to re-book at the airport?

Another question: Is the Shanghai Hongqiao station in the airport? Or do we need to travel from airport to station?

Question: What about Shanghai railway station (not Hongqiao), is this also at the airport or do we have to travel from airport to Shanghai station?

I wait your reply on these 3 questions.

Thanks

Iain