On a map with a scale of 1:2000000, the distance from city A to city B is 3.6 cm. How long does it take for a car to travel from city A to city B at a speed of 30 kilometers per hour?
在比例尺是1：2000000的地图上，甲市到乙市的距离是3.6厘米．汽车以每小时30千米的速度从甲市到达乙市要用几小时？
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">3.6 / (1/2_000_000) / 100_000 / 30</gadget>
<output>2.4</output>

<result>2.4</result>