On a map with a scale of (1/3000000), the length of the railway line from Hangzhou to Shanghai is 6.2 cm. What is the actual length of the railway line from Hangzhou to Shanghai in kilometers?
在比例尺是(1/3000000)的地图上，量得杭州到上海的铁路线长6.2厘米，杭州到上海的铁路线实际长是多少千米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">6.2 / (1/3_000_000) / 100_000</gadget>
<output>186</output>

<result>186</result>