The distance from Kunming to Xishuangbanna is about 630 kilometers. On a map with a scale of 1:9,000,000, how long should the distance be drawn?
昆明至西双版纳约有630千米，在一幅比例尺为1：9000000的地图上，应画多长的距离？
<gadget id="calculator">1 / 9_000_000</gadget>
<output>1/9_000_000 = around 0</output>

<gadget id="calculator">630 * 100_000 * (1/9_000_000)</gadget>
<output>7</output>

<result>7</result>