On a map with a scale of 1:4,000,000, the length of the roads in A and B is 8 cm. What is the actual length of the highway between A and B?
在比例尺是1：4000000的地图上，量得A、B两地公路长8厘米．A、B两地公路的实际长多少千米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">8 / (1/4_000_000) / 100_000</gadget>
<output>320</output>

<result>320</result>