A canal is 4 kilometers long. How many centimeters should it draw on a drawing with a scale of 1:500000?
一条水渠长4千米，把它画在比例尺是1：500000的图纸上，应画多少厘米？
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">4 * 100_000 * (1/500_000)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>