The distance between two stations A and B is 420 kilometers. The bus and the truck depart from station A to station B at the same time. The bus travels 60 kilometers per hour, and the truck travels 40 kilometers per hour. After arriving at station B, the bus stays for 1 hour, and then Return to Station A at the original speed. How many kilometers away from station B is the place where the two cars meet head-on?
甲、乙两站相距420千米，客车和货车同时从甲站出发驶向乙站，客车每小时行60千米，货车每小时行40千米，客车到达乙站后停留1小时，又以原速度返回甲站．求两车迎面相遇的地点离乙站有多少千米？
<gadget id="calculator">420 / 60</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 40</gadget>
<output>320</output>

<gadget id="calculator">420 - 320</gadget>
<output>100</output>

<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">1 * 60</gadget>
<output>60</output>

<result>60</result>