On a map with a scale of (1/200000), the distance between A and B is measured to be 10 cm. What is the actual distance between A and B in kilometers?
在比例尺是(1/200000)的一幅地图上，量得甲乙两地相距10厘米，甲乙两地实际距离是多少千米．
<gadget id="calculator">1 / 200_000</gadget>
<output>1/200_000 = around 0.000005</output>

<gadget id="calculator">10 / (1/200_000) / 100_000</gadget>
<output>20</output>

<result>20</result>