The seats of High-speed train, How is the difference between the first class and the second class?

hanghai-Hangzhou around 45 mintues                             First class 124 RMB      

                                                                                            Second class 78 RMB

Shanghai- Beijing  around 5 hours                               First class 935 RMB       

                                                                                     Second class 555 RMB

Shanghai- Yiwu  around 2 hours and 20 minutes     First class 108 RMB

                                                                                  Second class 90 RMB

Shanghai- Nanjing      around 1 hour 20 minitues          First class 220 RMB

                                                                                        Second class 140 RMB  

 Shanghai- Wenzhou     around 5 hours                          First class 213 RMB

                                                                                        Second class 178 RMB

Shanghai- Qingdao  around 6 hours and 40 mintues  First class 820 RMB

                                                                                    Second class 520 RMB