Car A drives from station A to station B, and cars B and C drive from station B to station A. The three cars start at the same time. Car A travels 45 kilometers per hour, and car B travels 39 kilometers per hour. Traveling 25 kilometers per hour, after two cars A and B meet, they drive for another 1 hour, when A and B meet, find the distance between A and B.
甲车从A站牌驶往B站，乙车、丙车从B站牌驶往A站，三车同时出发，甲车每小时行45千米，乙车每小时行39千米，甲车每小时行25千米，甲乙两车相遇后，又行驶1小时，甲车与乙车相遇，求A、B两站间的距离．
<gadget id="calculator">45 + 25</gadget>
<output>70</output>

<gadget id="calculator">39 - 45 - 25</gadget>
<output>-31</output>

<gadget id="calculator">45 + (-31)</gadget>
<output>14</output>

<gadget id="calculator">70 / 14</gadget>
<output>5</output>

<gadget id="calculator">45 + 39</gadget>
<output>84</output>

<gadget id="calculator">5 * 84</gadget>
<output>420</output>

<result>420</result>