train travels 70 kilometers per hour. It departs from A to B at 8:00 am one day. After traveling for 2 hours, it needs to stop for half an hour due to a railway failure. At 10:00 am, an express train also departs from station A and travels the same way. The route is 100 kilometers per hour. In order to drive safely, the distance between two trains should not be less than 10 kilometers. So how many kilometers should the train that leaves first stop before the express bus passes?
一列火车每小时行70千米，一天上午8：00从A地开往B地，行了2小时后遇铁路故障需要停车半小时，上午10：00一列特快客车也从A站出发，行同一路线，每小时行100千米，为了安全行车，两列火车间距不应少于10千米，那么先开出的火车最多再行多少千米后就应停车以便让特快客车通过？
<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">100 * 0.5</gadget>
<output>50</output>

<gadget id="calculator">140 - 50 - 10</gadget>
<output>80</output>

<gadget id="calculator">100 - 70</gadget>
<output>30</output>

<gadget id="calculator">80 / 30</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">(8/3) * 70</gadget>
<output>560/3 = around 186.666667</output>

<result>560/3 = around 186.666667</result>