The distance between the two places measured on a map with a scale of 1:1000000 is 4.5 cm. What is the distance between the two places on a map with a scale of 1:500000?
在比例尺是1：1000000的地图上量得两地的距离是4.5厘米，如果在比例尺是1：500000的地图上两地的距离是多少．
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

<gadget id="calculator">4.5 / (1/1_000_000)</gadget>
<output>4_500_000</output>

<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">4_500_000 * (1/500_000)</gadget>
<output>9</output>

<result>9</result>