On a map with a scale of 1:40000000, the distance between A and B is 2.5 cm. There is a plane flying from A to B at 8:00 in the morning and arriving at 10:00 in the morning. How many kilometers does the plane fly per hour? ?
在比例尺是1：40000000的地图上，量得甲、乙两地相距2.5厘米，上午8：00有一架飞机从甲地飞往乙地上午10：00到达，这架飞机每小时飞行多少千米？
<gadget id="calculator">1 / 40_000_000</gadget>
<output>1/40_000_000 = around 0</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">2.5 / (1/40_000_000) / 100_000 / 2</gadget>
<output>500</output>

<result>500</result>