The scale of a map is 1:3000000, and the distance between A and B on the map is 5cm, so what is the actual distance between A and B in km?
在一幅地图的比例尺是1：3000000，量得甲、乙两地之间的图上距离是5cm，那么甲、乙两地之间的实际距离是多少km．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">5 / (1/3_000_000) / 100_000</gadget>
<output>150</output>

<result>150</result>