On a map with a scale of 1:5000000, the distance from point A to point B is 4 cm, and it takes a car 2.5 hours to go from point A to point B. What is the speed of the car?
在一副比例尺为1：5000000的地图上，从A地到B地的距离为4厘米，一辆汽车从A地到B地用了2.5小时，这辆汽车的速度是多少．
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">4 / (1/5_000_000) / 100_000 / 2.5</gadget>
<output>80</output>

<result>80</result>