On a map with a scale of 1:5,000,000, the distance from point A to point B is 4 cm. If a car drives from point A to point B at a speed of 40 kilometers per hour, how long will it take to get there?
在比例尺是1：5000000的地图上，量得A地到B地的距离是4厘米，一辆汽车以每小时40千米的速度从A地开往B地，问几小时可以到达？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">4 / (1/5_000_000) / 100_000 / 40</gadget>
<output>5</output>

<result>5</result>