On a map with a scale of 1:40000000, the distance between Lanzhou and Urumqi is measured to be 5cm. What is the actual distance between Lanzhou and Urumqi?
在比例尺是1：40000000的地图上，量得兰州到乌鲁木齐的距离是5cm，兰州到乌鲁木齐的实际距离是多少？
<gadget id="calculator">1 / 40_000_000</gadget>
<output>1/40_000_000 = around 0</output>

<gadget id="calculator">5 / (1/40_000_000) / 100_000</gadget>
<output>2_000</output>

<result>2_000</result>