On a 1:20000000 map, the distance between airports A and B is 9 cm. How many hours does it take for an airplane to fly from airport A to airport B at a speed of 750 kilometers per hour?
在一幅1：20000000的地图上，量得甲、乙两地机场距离为9厘米，一架飞机以每小时750千米的速度从甲机场飞往乙机场，需要飞行几小时？
<gadget id="calculator">1 / 20_000_000</gadget>
<output>1/20_000_000 = around 0</output>

<gadget id="calculator">9 / (1/20_000_000) / 100_000 / 750</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>