On a map with a scale of 1:200000000, the length of the road between A and B is measured to be 3.6cm. A car travels from point A to point B at an average speed of 80km per hour. How many hours will it take to get there?
在一幅比例尺为1：200000000的地图上，量得甲、乙两地之间的公路长3.6cm．一辆汽车以平均每小时80km的速度人甲地开往乙地，要几小时才能到达？
<gadget id="calculator">1 / 200_000_000</gadget>
<output>1/200_000_000 = around 0</output>

<gadget id="calculator">3.6 / (1/200_000_000) / 100_000 / 80</gadget>
<output>90</output>

<result>90</result>