On a map, 1 cm on the map represents an actual distance of 50 km. What is the scale of the map
在一幅地图上，图上1厘米表示实际距离50千米．地图的比例尺是多少
<gadget id="calculator">50 * 100_000</gadget>
<output>5_000_000</output>

<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<result>1/5_000_000 = around 0</result>