On the (1/20000000) map, the distance between A and B is 4cm, and the speed of a car is 80km/h. How many hours will it take to complete the journey?
在(1/20000000)的地图量得甲乙之间的距离是4cm，一辆汽车的速度是80km/h，行完全程要几小时？
<gadget id="calculator">1 / 20_000_000</gadget>
<output>1/20_000_000 = around 0</output>

<gadget id="calculator">4 / (1/20_000_000) / 100_000 / 80</gadget>
<output>10</output>

<result>10</result>