The length of a rectangular airport is 3800m. On a map with a scale of (1/10000), how many centimeters should be drawn to represent the length of the airport.
一个长方形飞机场的长是3800m，在比例尺是(1/10000)的地图上，应画多少cm长的线段来表示飞机场的长．
<gadget id="calculator">3_800 * 100</gadget>
<output>380_000</output>

<gadget id="calculator">1 / 10_000</gadget>
<output>1/10_000 = around 0.0001</output>

<gadget id="calculator">380_000 * (1/10_000)</gadget>
<output>38</output>

<result>38</result>