The railway from Ningbo to Hangzhou is 168 kilometers long. How much should be drawn on a national railway operation map with a scale of 1:3,000,000.
宁波到杭州的铁路长168千米，在一幅比例尺1：3000000的全国铁路运行图上，应画多少．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">168 * 100_000 * (1/3_000_000)</gadget>
<output>28/5 = around 5.6</output>

<result>28/5 = around 5.6</result>