On the 1:4,000,000 map, Xiao Ming measured that the distance from Yangzhou to Beijing is 30 centimeters, and how many kilometers is it from Yangzhou to Beijing.
在1：4000000的地图上，小明量得扬州到北京的距离是30厘米，扬州到北京约多少千米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">30 / (1/4_000_000) / 100_000</gadget>
<output>1_200</output>

<result>1_200</result>