A passenger car travels from Beijing to Shanghai at 90 kilometers per hour, and at the same time a train travels from Shanghai to Beijing at 80 kilometers per hour. After 8 hours, the distance between the two cars is still 100 kilometers. How many kilometers is the railway from Beijing to Shanghai?
一列客车从北京开往上海，每小时行90千米，同时有一列火车从上海开往北京，每小时行80千米，经过8小时两车还相距100千米．北京到上海的铁路长多少千米？
<gadget id="calculator">90 + 80</gadget>
<output>170</output>

<gadget id="calculator">170 * 8</gadget>
<output>1_360</output>

<gadget id="calculator">1_360 + 100</gadget>
<output>1_460</output>

<result>1_460</result>