A passenger car and a truck drive from A to B at the same time. The bus travels 70 kilometers per hour and the truck travels 50 kilometers per hour. As a result, the truck takes 2 hours longer than the bus to arrive at B. Question: How many kilometers are there between A and B?
一辆客车和一辆货车同时从甲地开往乙地，客车每小时行70千米，货车每小时行50千米．结果货车比客车多用2小时到达乙地．问：甲乙两地相距多少千米？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">70 - 50</gadget>
<output>20</output>

<gadget id="calculator">100 / 20</gadget>
<output>5</output>

<gadget id="calculator">70 * 5</gadget>
<output>350</output>

<result>350</result>