The distance between A and B is 300 kilometers, how many centimeters should be drawn on a map with a scale of 1:2000000.
甲、乙两地相距300千米，在比例尺是1：2000000的地图上应画多少厘米．
<gadget id="calculator">1 / 200_000</gadget>
<output>1/200_000 = around 0.000005</output>

<gadget id="calculator">(1/200_000) / 10</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">300 * 100_000 * (1/2_000_000)</gadget>
<output>15</output>

<result>15</result>