On a map with a scale of 1:4,000,000, the distance from Beijing to Tianjin is measured to be 3 centimeters. If a car drives from Beijing to Tianjin at a speed of 80 kilometers per hour, how long will it take to arrive?
在比例尺为1：4000000地图上，量得北京到天津的距离是3厘米，一辆汽车以每小时80千米的速度从北京开往天津，几小时到达？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">3 / (1/4_000_000) / 100_000 / 80</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>