On a map with a scale of 1:6,000,000, the distance from Shanghai to Beijing is measured to be 20 centimeters. How long does it take to take a plane traveling 800 kilometers per hour from Beijing to Shanghai?
在一幅比例尺是1：6000000的地图上，量得上海到北京的距离是20厘米，乘坐一架每小时行驶800千米从北京飞往上海的飞机，几小时到达？
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">20 / (1/6_000_000) / 100_000 / 800</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>