In a map with a scale of 1:50000000, the distance between Xining and Yushu on the map is 1.6 cm. What is the actual distance between Xining and Yushu in kilometers?
在一幅比例尺是1：50000000的地图中，西宁到玉树的图上距离是1.6厘米，西宁到玉树的实际距离是多少千米．
<gadget id="calculator">1 / 50_000_000</gadget>
<output>1/50_000_000 = around 0</output>

<gadget id="calculator">1.6 / (1/50_000_000) / 100_000</gadget>
<output>800</output>

<result>800</result>