The scale is (1/30000000), which means that the distance of 1 cm on the map is equivalent to the actual distance in kilometers on the ground.
比例尺是(1/30000000)，它表示地图上1厘米的距离相当于地面实际距离多少千米．
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">1 / (1/30_000_000) / 100_000</gadget>
<output>300</output>

<result>300</result>