Stations A and B are 256 kilometers apart. It takes 2.5 hours for car A to drive from station A to station B, and it takes 4 hours for car B to drive from station B to station A. At 8:30, the two cars depart from station A and station B respectively and drive towards each other. When the two cars met, what fraction of the journey did Car A travel?
甲、乙两站相距256千米．A车从甲站开到乙站需2.5时，B车从乙站开到甲站需4时.8：30两车分别从甲、乙两站出发，相向而行．两车相遇时，A车行了全程的几分之几？
<gadget id="calculator">256 / 2.5</gadget>
<output>102.4</output>

<gadget id="calculator">256 / 4</gadget>
<output>64</output>

<gadget id="calculator">102.4 + 64</gadget>
<output>166.4</output>

<gadget id="calculator">102.4 / 166.4</gadget>
<output>0.615385</output>

<result>0.615385</result>