The total length of a highway is 155 kilometers. On the 1:500,000 highway mileage map, what is the length in centimeters?
某高速公路全长155千米，在1：500000的公路里程地图上，长应当是多少厘米．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">155 * 100_000 * (1/500_000)</gadget>
<output>31</output>

<result>31</result>