The distance between A and B is 900 kilometers, how many centimeters should be drawn on a map with a scale of l:30000000.
甲乙两地相距900千米，在比例尺是l：30000000的地图上应画多少厘米．
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">900 * 100_000 * (1/30_000_000)</gadget>
<output>3</output>

<result>3</result>