The speeds of cars A and B are 50 km/h and 40 km/h respectively. Car B first drives from station B to station A. When it arrives at point D, which is 72 kilometers away from station B, car A starts from station A. Drive to station B and meet car B at point C. If the distance between the point C where A and B meet and the distance between point A and point B is 3:4, then how much is the distance between point A and point B? rice?
甲、乙两车的速度分别是50千米/时，40千米/时，乙车先从B站开往A站，当到离B站72千米的D地时，甲车从A站开往B站，在C地与乙车相遇，如果甲、乙两车相遇地C地离A、B两站的路程比是3：4，那么A、B两站之间的路程是多少千米？
<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<gadget id="calculator">15 + 20</gadget>
<output>35</output>

<gadget id="calculator">9 * 35</gadget>
<output>315</output>

<result>315</result>