The scale of a map is 1:30000000, the distance between A and B on the map is 6.5cm, how many kilometers is the actual distance?
一张地图比例尺为1：30000000，甲、乙两地图上距离为6.5cm，实际距离为多少千米．
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">6.5 / (1/30_000_000) / 100_000</gadget>
<output>1_950</output>

<result>1_950</result>