Can you advise what is the best way to get to the location for the below 3 combination?

1. HKIA to Zhongshan, both cross border coach and ferry are available. But there are only three ferries each day running at 11:40, 15:50 and 20:10. While coaches are available from 07:30 to 18:45 with an interval of 10 to 30 minutes. So you can choose the best one according to your arrival time.
2. Zhongshan to Guangzhou, you can take bus to reach. Buses are available in Zhongshan Xiaolan Bus Station, the City Bus Station and the South Bus Station.
3. Guangzhou to HKIA, you can take the cross border coach from Yuexiu South Coach Terminal, China Hotel or Dongfang Hotel. BTW, coach would take about 3-3.5 hours to reach. Coaches are available from 07:00 with an interval of 10 - 30 minutes.