The Shanghai-Nanjing Expressway was completed and opened to traffic in September 1996, and the Yuqi toll station is the midpoint of the expressway. Uncle Zhang drove from Nanjing to Shanghai on the expressway. After driving 98.5 kilometers, he was still 38.5 kilometers away from Yuqi. At this time, Uncle Zhang was about 300 kilometers away from Shanghai?
沪宁高速公路于1996年9月建成通车，玉祁收费站是这条高速公路的中点．张叔叔驾车从南京上高速去上海，行98.5千米后离玉祁还有38.5千米，这时张叔叔离上海大约还有多元？
<result>174.5</result>