Xiao Wang intends to go to Shanghai from Lianyungang. He measured the road distance from Lianyungang to Shanghai on a map with a scale of 1:4,000,000 to be about 12.2 centimeters. If calculated on average at 80 kilometers per hour, how many hours does it take Xiao Wang to travel from Lianyungang to Shanghai?
小王打算从连云港去上海，他在一幅比例尺是1：4000000的地图上量得连云港到上海的公路距离约是12.2厘米．如果按平均每小时行80千米计算，小王从连云港到上海大约需要多少小时？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">12.2 / (1/4_000_000) / 100_000 / 80</gadget>
<output>6.1</output>

<result>6.1</result>