The distance from Tianjin to Beijing is 120 kilometers. If you use a scale of (1/3000000) to draw a plan, what is the distance in centimeters on the map from Tianjin to Beijing?
天津到北京的距离是120千米，如果用(1/3000000)的比例尺画平面图，天津到北京的图上距离是多少厘米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">120 * 100_000 * (1/3_000_000)</gadget>
<output>4</output>

<result>4</result>