The scale of a map is 1:4000000. The distance between A and B ports on this map is 3.6 cm. What is the actual distance in kilometers between them?
一幅地图的比例尺是1：4000000，这幅地图上甲、乙两港口相距3.6厘米，它们之间的实际距离是多少千米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">3.6 / (1/4_000_000) / 100_000</gadget>
<output>144</output>

<result>144</result>