Oriental Plaza is 30 kilometers away from Zhongshan Park, how many centimeters is it on a map with a scale of (1/200000).
东方广场距中山公园30千米，在一幅比例尺为(1/200000)的地图上是多少厘米．
<gadget id="calculator">1 / 200_000</gadget>
<output>1/200_000 = around 0.000005</output>

<gadget id="calculator">30 * 100_000 * (1/200_000)</gadget>
<output>15</output>

<result>15</result>