The expressway from Beijing to Changchun is about 970km long, and the expressway from Beijing to Qinhuangdao is about 280km long. It takes 3.5 hours for a car to drive from Beijing to Changchun to Qinhuangdao. At this speed, how long does it take for the whole journey from Beijing to Changchun?
北京到长春的高速公路大约长970km，北京到秦皇岛的大约长280km．一辆汽车从北京出发开往长春，行驶到秦皇岛时用了3.5小时，按照这个速度，北京到长春全程需要多少小时？
<gadget id="calculator">280 / 3.5</gadget>
<output>80</output>

<gadget id="calculator">970 / 80</gadget>
<output>97/8 = around 12.125</output>

<result>97/8 = around 12.125</result>