On a map with a scale of 1:50000000, the distance from Shanghai to Hangzhou is 3.4 cm. What is the actual distance from Shanghai to Hangzhou?
在一幅比例尺是1：50000000的地图上，量得上海到杭州的距离是3.4厘米．上海到杭州的实际距离是多少？
<gadget id="calculator">1 / 50_000_000</gadget>
<output>1/50_000_000 = around 0</output>

<gadget id="calculator">3.4 / (1/50_000_000) / 100_000</gadget>
<output>1_700</output>

<result>1_700</result>