The railway from Beijing to Shanghai is 1,460 kilometers long. A passenger car runs from Beijing to Shanghai, and a freight train runs from Shanghai to Beijing at the same time. After 8 hours, the distance between the two cars is still 100 kilometers. The passenger car travels 90 kilometers per hour, how many kilometers per hour does the truck travel? (solution by equation)
北京到上海的铁路长1460千米，一列客车从北京开往上海，同时有一列货车从上海开往北京，经过8小时两车还相距100千米．客车每小时行90千米，货车每小时行多少千米？(用方程解)
<gadget id="calculator">90 * 8</gadget>
<output>720</output>

<gadget id="calculator">1_460 - 720 - 100</gadget>
<output>640</output>

<gadget id="calculator">640 / 8</gadget>
<output>80</output>

<result>80</result>