On a map with a scale of 1:5000000, what is the actual distance in kilometers represented by 3 centimeters?
在比例尺是1：5000000的地图上，3厘米表示的实际距离是多少千米．
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

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

<result>150</result>