The students go on a trip. It is 517 kilometers from Kunming to Lijiang. We have traveled 248 kilometers. How far is it to Lijiang?
同学们去旅游，从昆明到丽江有517千米，已经走了248千米，还有多远到丽江？
<gadget id="calculator">517 - 248</gadget>
<output>269</output>

<result>269</result>