Cars A and B start from places 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 the same, car B will travel 5 kilometers per hour, and the two cars will still start from A. , B and two places start at the same time and go towards each other, then the meeting place is 12 kilometers away from C; if the speed of car B remains the same, car A travels 5 kilometers more per hour, and the two cars still travel from places A and B at the same time Starting from the opposite direction, 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地，如果甲车的速度不变，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，则相遇的地点距离C地12千米；如果乙车的速度不变，甲车每小时多行5千米，且两车还从A，B两地同时出发相向而行，则相遇地点距离C地16千米．甲车原来每小时行多少千米？
<gadget id="calculator">12 + 16</gadget>
<output>28</output>

<gadget id="calculator">28 / 5</gadget>
<output>28/5 = around 5.6</output>

<gadget id="calculator">6 - (28/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<result>30</result>