On a traffic map with a scale of 1:3000000, the length of the road from A to B is measured to be 11.2cm. Master Wang plans to drive from place A to place B in 4 hours, how many kilometers per hour will he travel on average?
在一幅比例尺是1：3000000的交通图上，量得从甲地到乙地之间的公路长是11.2cm．王师傅驾车计划4小时从甲地到乙地，平均每小时要行多少千米？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">11.2 / (1/3_000_000) / 100_000 / 4</gadget>
<output>84</output>

<result>84</result>