On a map with a scale of 1:4000000, the length between A and B is 24.5 cm. What is the actual distance between A and B?
在一幅比例尺1：4000000的地图上，量得A、B两地间长24.5厘米．A、B两地间的实际长度是多少千米？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">24.5 / (1/4_000_000) / 100_000</gadget>
<output>980</output>

<result>980</result>