On a map with a scale of 1:50000000, the measured distance from Lanzhou to Urumqi is 3.8cm. What is the actual distance from Lanzhou to Urumqi?
在一幅比例尺是1：50000000的地图上，量的兰州到乌鲁木齐的距离是3.8cm，兰州到乌鲁木齐的实际距离是多少．
<gadget id="calculator">1 / 50_000_000</gadget>
<output>1/50_000_000 = around 0</output>

<gadget id="calculator">3.8 / (1/50_000_000) / 100_000</gadget>
<output>1_900</output>

<result>1_900</result>