On a map with a scale of 1:4000000, the distance between A and B is measured to be 5 cm. What is the actual distance between A and B in kilometers?
在比例尺1：4000000的地图上，量得甲乙两地间的距离是5厘米，甲乙两地的实际距离是多少千米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">5 / (1/4_000_000) / 100_000</gadget>
<output>200</output>

<result>200</result>