On a map with a scale of 1:8000000, the distance between A and B is 4.5 cm. If a car drives from A to B at a speed of 40 kilometers per hour, how long will it take to arrive?
在比例尺是1：8000000的地图上，量得甲、乙两地之间的距离是4.5厘米，一辆汽车以每小时40千米的速度从甲地开往乙地，几小时到达？
<gadget id="calculator">1 / 8_000_000</gadget>
<output>1/8_000_000 = around 0</output>

<gadget id="calculator">4.5 / (1/8_000_000) / 100_000 / 40</gadget>
<output>9</output>

<result>9</result>