Cars A and B respectively start from A and B at the same time and drive towards each other, and meet at point C after 6 hours. If the speed of car A remains unchanged, and car B travels 5 kilometers more per hour, and the two cars start from A and B at the same time and go towards each other, then the meeting point is 12 kilometers away from point C. If B’s speed remains unchanged, A 5 kilometers per hour, the meeting point is 16 kilometers away from point C. How many kilometers did A car travel per hour?
甲、乙两车分别从A、B两地同时出发相向而行，6小时后相遇在C点．如果甲车速度不变，乙车每小时多行5千米，且两车还从A、B两地同时出发相向而行，则相遇地点距C点12千米，若乙速度不变，甲每小时多行5千米，则相遇地点距C点16千米．甲车原来每小时行多少千米？
<gadget id="calculator">12 / 0.4</gadget>
<output>30</output>

<result>30</result>