On a map with a scale of 1:25000000, the distance between A and B is 4.2 cm. How many hours does it take for a car to travel from A to B at an average speed of 75 kilometers per hour?
在比例尺为1：25000000的地图上，量得A、B两地的距离为4.2厘米，一汽车以平均每小时75千米的速度从A地到B地，大约需要多少小时．
<gadget id="calculator">1 / 25_000_000</gadget>
<output>1/25_000_000 = around 0</output>

<gadget id="calculator">4.2 / (1/25_000_000) / 100_000 / 75</gadget>
<output>14</output>

<result>14</result>