On a map with a scale of 1:5,000,000, the distance between Beijing and Nanjing is measured to be 18 centimeters. If a plane flies from Beijing to Nanjing at a speed of 750 kilometers per hour, how many hours will it take?
在比例尺是1：5000000的地图上，量得北京到南京的距离是18厘米，若一架飞机以每小时750千米的速度从北京飞南京，大约需要多少小时？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">18 / (1/5_000_000) / 100_000 / 750</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>