On a map with a scale of 1:3000000, the distance between the two places is 20 centimeters, and a car can travel the entire distance in 8 hours. What is the speed of this car in kilometers?
在比例尺是1：3000000的地图上，量得两地距离是20厘米，一辆汽车8小时可能行完全程．这辆汽车的速度是多少千米？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">20 / (1/3_000_000) / 100_000 / 8</gadget>
<output>75</output>

<result>75</result>