On a map with a scale of 1:60000000, the distance between A and B is 2.5 cm. There is a plane flying from A to B at 8:30 am and arriving at 9:45 am. How much does the plane travel per hour? km.
在比例尺是1：60000000的地图上，量得甲乙两地的距离2.5厘米，上午8点30分有一架飞机从甲地飞往乙地，上午9点45分到达，这架飞机每小时行多少千米．
<gadget id="calculator">1 / 60_000_000</gadget>
<output>1/60_000_000 = around 0</output>

<gadget id="calculator">2.5 / (1/60_000_000) / 100_000 / 1.25</gadget>
<output>1_200</output>

<result>1_200</result>