On a map with a scale of (1/30000000), the distance from Chongqing to Hebei is measured as 3.5 centimeters. A plane departs from Chongqing to Hebei at 8 am and arrives at 9:30 am. What is the average flight speed of this plane per hour? km?
在比例尺为(1/30000000)的地图上，量得重庆到河北的距离为3.5厘米，一架飞机上午8时从重庆开往河北，上午9时30分到达，这架飞机平均每小时飞行多少千米？
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">3.5 / (1/30_000_000) / 100_000 / 1.5</gadget>
<output>700</output>

<result>700</result>