On a map with a scale of 1:2,000,000, the distance between A and B is measured to be 8 cm. If a car drives from A to B at a speed of 40 kilometers per hour, how long will it take to get there?
在一幅比例尺为1：2000000的地图上，量得甲乙两地距离8厘米，一辆汽车以每小时40千米的速度从甲地开往乙地，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">8 / (1/2_000_000) / 100_000 / 40</gadget>
<output>4</output>

<result>4</result>