On a map of 1:3000000, the distance between Chenzhou City and Guangzhou City in my country is 8.4 cm. A high-speed bus travels 80 kilometers per hour from Chenzhou to Guangzhou. Li Ming took this high-speed bus from Chenzhou to Guangzhou. How long does it take to get from Chenzhou to Guangzhou?
在1：3000000的地图上，量得我国郴州市到广州市之间的距离是8.4厘米，一辆高速公共汽车从郴州到广州，每小时行80千米，李明乘这辆高速公共汽车从郴州到广州要用多少小时？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">8.4 / (1/3_000_000) / 100_000 / 80</gadget>
<output>3.15</output>

<result>3.15</result>