On a map with a scale of (1/20000000), if you take a high-speed rail with a speed of 150 kilometers per hour from place A to reach place B in 6 hours, what is the distance between places A and B on the map in centimeters?
在一副比例尺为(1/20000000)的地图上，若从甲地乘坐时速为150千米的高铁，6小时到达乙地，则甲乙两地的图上距离为多少厘米．
<gadget id="calculator">1 / 20_000_000</gadget>
<output>1/20_000_000 = around 0</output>

<gadget id="calculator">150 * 6 * 100_000 * (1/20_000_000)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>