In January 2007, the "bullet" train was launched from Shanghai to Nanjing. It used to take 3 hours to get there by ordinary train, but now it only takes 2 hours to reach Nanjing. The total length of the railway from Shanghai to Nanjing is about 330 kilometers. The "bullet" train On average, how many kilometers per hour faster than ordinary trains?
2007年1月，上海至南京开行"子弹头"列车，原来乘坐普通列车3小时才能到达，现在只要2小时就能到达南京，上海到南京的铁路全长约330千米，"子弹头"列车平均每小时比普通列车快多少千米？
<gadget id="calculator">330 / 2</gadget>
<output>165</output>

<gadget id="calculator">330 / 3</gadget>
<output>110</output>

<gadget id="calculator">165 - 110</gadget>
<output>55</output>

<result>55</result>