On a map with a scale of 1:10000, if the distance between A and B is 3 cm, what is the actual distance in kilometers between A and B?
在比例尺1：10000的地图上，甲乙两地相距3厘米，则甲、乙两地的实际距离是多少千米．
<gadget id="calculator">1 / 10_000</gadget>
<output>1/10_000 = around 0.0001</output>

<gadget id="calculator">3 / (1/10_000) / 100_000</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>