On a map with a scale of 1:40000000, the distance between A and B is 5cm. A plane flies from A to B at 12:00 noon and arrives at 2:00 pm. How much does the plane fly on average per hour?
在比例尺是1：40000000的地图上，量得甲、乙两地的距离是5cm，一架飞机中午12点从甲地飞往乙地，下午两点到达．这架飞机平均每小时飞行多少．
<gadget id="calculator">1 / 40_000_000</gadget>
<output>1/40_000_000 = around 0</output>

<gadget id="calculator">14 - 12</gadget>
<output>2</output>

<gadget id="calculator">5 / (1/40_000_000) / 100_000 / 2</gadget>
<output>1_000</output>

<result>1_000</result>