The actual distance between Zhangye and Beijing is 2,100 kilometers. On a map with a scale of 1:30,000,000, how many centimeters should the distance between the two cities be drawn?
张掖到北京的实际距离是2100千米，在比例尺1：30000000的地图上，两市之间的距离应画多少厘米？
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">2_100 * 100_000 * (1/30_000_000)</gadget>
<output>7</output>

<result>7</result>