On a map of China with a scale of 1:500,0000, the distance from Shanghai to Hangzhou is 3.4 centimeters. Calculate, how many kilometers is the actual distance from Shanghai to Hangzhou?
在比例尺是1：500，0000的中国地图上，量得上海到杭州的距离是3.4厘米．计算一下，上海到杭州的实际距离大约是多少千米？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">3.4 / (1/5_000_000) / 100_000</gadget>
<output>170</output>

<result>170</result>