A train can travel 318 kilometers in 3 hours. Calculated at this speed, it takes 20 hours to travel from Chengdu to Beijing. How many kilometers is the railway from Chengdu to Beijing?
一列火车3小时可行318千米，照这样的速度计算，从成都到北京需要20小时，成都到北京的铁路大约长多少千米？
<gadget id="calculator">318 / 3</gadget>
<output>106</output>

<gadget id="calculator">106 * 20</gadget>
<output>2_120</output>

<result>2_120</result>