On a map with a scale of 1:10000, the measured distance between the two places is 4 cm. What is the actual distance between the two places?
在比例尺是1：10000的地图上，量得两地间的距离是4厘米，两地的实际距离是多少？
<gadget id="calculator">1 / 10_000</gadget>
<output>1/10_000 = around 0.0001</output>

<gadget id="calculator">4 / (1/10_000) / 100_000</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>