The actual distance between the two places is 1800km, what is the distance on the map with a scale of 1:3000000?
两地之间的实际距离是1800km，在比例尺为1：3000000的地图上的图上距离为多少．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">1_800 * 100_000 * (1/3_000_000)</gadget>
<output>60</output>

<result>60</result>