The railway between Nanjing and Jinan is 680 kilometers long. A train runs from Nanjing to Jinan at a speed of 108 kilometers per hour. How many kilometers will the train be from Nanjing in three hours?
南京到济南之间的铁路长680千米．一列火车从南京以每小时108千米的速度开往济南，三小时后火车距南京多少千米？
<gadget id="calculator">108 * 3</gadget>
<output>324</output>

<gadget id="calculator">680 - 324</gadget>
<output>356</output>

<result>356</result>