On a map with a scale of 1:5,000,000, the length of the road between A and B is measured to be 3 cm. What is the actual distance between the two cities?
在一幅比例尺是1：5000000的地图，量得甲、乙两城之间的公路长3厘米．甲乙两城的实际距离是多少？
<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>