On a 1:4000000 map, the length of the road from A to B is measured to be 2.5 cm. It takes 1.25 hours for a car to drive from point A to point B, how many kilometers per hour does the car travel on average?
在一幅1：4000000的地图上，量得从甲地到乙地的公路长2.5厘米．一辆汽车从甲地开往乙地用了1.25小时，这辆汽车平均每小时行驶多少千米？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">2.5 / (1/4_000_000) / 100_000 / 1.25</gadget>
<output>80</output>

<result>80</result>