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1. 设甲乙两地相距x千米                  2.设货车的速度是x千米/时

    （85+62）×3=x-36                                             78×2.5=2x+65   

                441=x-36                                                195=2.5x+65     

                     x=477                                                2.5x=130

                                                                                    x=52

                                                                     答：货车每小时行52千米.

答：甲乙两地相距477千米.