On a map with a scale of 1:2,000,000, the distance from Qingdao to Jinan is 4 cm. A train travels from Qingdao to Jinan at 80 kilometers per hour. How long does it take to get there?
在比例尺是1：2000000的地图上量得青岛到济南的距离是4厘米，一列火车从青岛开往济南，每小时行80千米，几小时能到达？
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">4 / (1/2_000_000) / 100_000</gadget>
<output>80</output>

<gadget id="calculator">80 / 80</gadget>
<output>1</output>

<result>1</result>