On a 1:5,000,000 map, the distance between A and B is 3 cm. How many hours does it take for a car to drive from A to B at a speed of 30 kilometers per hour?
在1：5000000的地图上，量得A、B两地相距3厘米，一辆汽车以每小时30千米的速度，从A地开往B地，需要多少小时到达．
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">3 / (1/5_000_000) / 100_000 / 30</gadget>
<output>5</output>

<result>5</result>