On a map with a scale of 1:4500000, if the actual distance between the two cities is 135 kilometers, how many centimeters should be drawn.
在比例尺1：4500000的地图上，若两城实际距离为135千米，应画多少厘米．
<gadget id="calculator">1 / 4_500_000</gadget>
<output>1/4_500_000 = around 0</output>

<gadget id="calculator">135 * 100_000 * (1/4_500_000)</gadget>
<output>3</output>

<result>3</result>