We are flying into Guangzhou landing on November 20th just to leave the next day for Beijing.

We will be arriving back in Guangzhou on the 27th and staying with a friend there until the 30th (still under 72 hours). On the 30th we will be traveling to Hong Kong by train and then back to Guangzhou on the 2nd to leave back to the US on rhe 3rd. All of our stays in china are under 24 hours or 72 hours. My question is if we qualify for the 72 hour transit even though we are leaving china to Hong Kong by train not flight?