On a map with a scale of 1:4,000,000, the measured distance between A and B is 4.5 cm. A car travels from A to B at a speed of 40 kilometers per hour. How long does it take?
在比例尺是1：4000000的地图上，量的甲乙两地的距离是4.5厘米，一辆汽车以每小时40千米的速度从甲地到乙地，几小时到达？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">4.5 / (1/4_000_000) / 100_000 / 40</gadget>
<output>4.5</output>

<result>4.5</result>