Mingming took the train from Beijing to Shanghai with an average speed of 132 km/h on Saturday, and the whole journey took 10 hours. It took only 5 hours to return by high-speed rail on Sunday. What is the average speed of the high-speed rail?
明明周六乘坐平均速度为132千米/时的火车从北京赶往上海，全程用了10小时．周日乘坐高铁返回，只用了5小时，高铁的平均速度是多少？
<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">132 * 2</gadget>
<output>264</output>

<result>264</result>