On a map with a scale of (1/5000000), the distance between A and B is 12 cm. How many hours does it take for a train to travel from A to B at a speed of 100 km/h?
在一幅比例尺是(1/5000000)的地图上，量得甲、乙两个城市的距离是12厘米．一列货车以每小时100千米的速度从甲地开往乙地，需要多少小时才能到达？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">12 / (1/5_000_000) / 100_000 / 100</gadget>
<output>6</output>

<result>6</result>