Measured on the map with a scale of 1:5000000, the distance between A and B is 6.2 cm. What is the actual distance in kilometers between the two cities?
在比例尺是1：5000000的图上量得甲乙两城的距离是6.2厘米，两地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">6.2 / (1/5_000_000) / 100_000</gadget>
<output>310</output>

<result>310</result>