The total length of the Qinghai-Tibet Railway is 1,956 kilometers, which is 384 kilometers longer than four times that of the Shandong Jiaoji Railway. How many kilometers is the Jiaoji Railway?
青藏铁路全长1956千米，比山东胶济铁路的4倍还多384千米．胶济铁路长多少千米？
<gadget id="calculator">1_956 - 384</gadget>
<output>1_572</output>

<gadget id="calculator">1_572 / 4</gadget>
<output>393</output>

<result>393</result>