On a 1:40000000 map, the distance between airports A and B is 3 centimeters. How many hours does it take for an airliner to fly from A to B at a speed of 600 kilometers per hour?
在一幅1：40000000的地图上，量得甲、乙两个机场的距离是3厘米，一架民航客机以每小时600千米的速度从甲地飞往乙地，需要飞行几小时？
<gadget id="calculator">1 / 40_000_000</gadget>
<output>1/40_000_000 = around 0</output>

<gadget id="calculator">3 / (1/40_000_000) / 100_000 / 600</gadget>
<output>2</output>

<result>2</result>