On a map with a scale of 1:50000000, the distance between A and B is 8 centimeters. An airplane flies from A to B at 10 am and arrives at 2 pm. How many kilometers per hour does the plane fly on average? ?
在比例尺为1：50000000的地图上，量得甲乙两地的距离是8厘米，一架飞机上午10时从甲地飞往乙地，下午2时到达，这架飞机平均每小时飞行多少千米？
<gadget id="calculator">1 / 50_000_000</gadget>
<output>1/50_000_000 = around 0</output>

<gadget id="calculator">8 / (1/50_000_000) / 100_000 / 4</gadget>
<output>1_000</output>

<result>1_000</result>