A luxury passenger car departed from Jinan on July 1, 2006, and drove to Qingdao along the "Jinan-Qingdao" expressway. Departure at 7:30, arrive in Qingdao at 12:30, the bus travels an average of 70 kilometers per hour. How many kilometers is the expressway from Jinan to Qingdao?
一辆豪华客车在2006年7月1日这天从济南出发，沿"济南--青岛"高速公路开往青岛．7：30出发，12：30到达青岛，客车平均每小时行驶70千米．济南至青岛的高速公路全长多少千米？
<gadget id="calculator">12.5 - 7.5</gadget>
<output>5</output>

<gadget id="calculator">70 * 5</gadget>
<output>350</output>

<result>350</result>