On a map with a scale of 1:4,000,000, the distance between A and B is 8 cm. How many hours does it take for a car to travel from A to B at a speed of 80 kilometers per hour?
在一幅比例尺是1：4000000的地图上，量得甲、乙两地间的距离是8厘米，一辆汽车以每小时80千米的速度从甲地到乙地，需行驶几小时？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">8 / (1/4_000_000) / 100_000 / 80</gadget>
<output>4</output>

<result>4</result>