On a map with a scale of 1:5000000, the distance between A and B is 3.8cm. What is the actual distance between A and B?
在比例尺是1比5000000的地图上，量得A、B两地的距离是3.8cm，A、B两地的实际距离是多少．
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">3.8 / (1/5_000_000) / 100_000</gadget>
<output>190</output>

<result>190</result>