The Beijing-Guangzhou Railway is about 2,400 kilometers long, and the length of the Chengdu-Chongqing Railway is 77 kilometers shorter than that of the Beijing-Guangzhou Railway (1/4). How many kilometers is the length of the Chengdu-Chongqing Railway?
京广铁路约长2400千米，成渝铁路的长度比京广铁路的(1/4)少77千米，成渝铁路长多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2_400 * (1/4)</gadget>
<output>600</output>

<gadget id="calculator">600 - 77</gadget>
<output>523</output>

<result>523</result>