On a map with a scale of 1:30000000, the distance between A and B on the map is 6 cm. A plane flies from point A to point B at a speed of 800 kilometers per hour. How long does it take to get there?
在比例尺是1：30000000的地图上，甲、乙两地航空线的图上距离是6厘米．一架飞机以每小时800千米的速度从甲地飞往乙地，几小时可以到达？
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">6 / (1/30_000_000) / 100_000 / 800</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>