The distance between A and B is 30km. On a map with a scale of 1:1000000, what is the distance in cm on the map?
甲、乙两地相距30km，在比例尺是1：1000000的地图上，图上距离应是多少cm．
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

<gadget id="calculator">30 * 100_000 * (1/1_000_000)</gadget>
<output>3</output>

<result>3</result>