A plane flies from Jiangcheng to Haicheng at 11:30, and arrives at Haicheng at 6:30 pm. The flight distance between Jiangcheng and Haicheng is 4200 kilometers. How many kilometers does this passenger plane fly on average per hour?
一架飞机11：30分从江城飞往海城，下午6时30分到达海城，江城和海城之间的航程是4200千米，这架客机平均每时飞行多少千米？
<gadget id="calculator">4_200 / 8</gadget>
<output>525</output>

<result>525</result>