On a map with a scale of 1:2000000, the distance between A and B is 15 cm. How many hours does it take for a car to travel from A to B at a speed of 75 km/h?
在比例尺是1：2000000的地图上，量得甲、乙两地的距离是15厘米．一辆汽车以每小时75千米的速度从甲地开往乙地，需要多少小时到达？
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">15 / (1/2_000_000) / 100_000 / 75</gadget>
<output>4</output>

<result>4</result>