The distance between A and B is 90 kilometers, how many centimeters should be drawn on a plan with a scale of 1:3000000.
甲、乙两地相距90千米，在比例尺是1：3000000的平面图上应画多少厘米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">90 * 100_000 * (1/3_000_000)</gadget>
<output>3</output>

<result>3</result>