On a map with a scale of (1/60000000), the distance between A and B is 2.5 cm. A plane flies from place A to place B at 8:30 am and arrives at 9:30 am, how many kilometers per hour does the plane fly on average?
在比例尺为(1/60000000)的地图上，量得甲乙两地的距离为2.5厘米．一架飞机上午8：30分从甲地飞往乙地，上午9：30分到达，这架飞机平均每小时飞多少千米？
<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</gadget>
<output>1_500</output>

<result>1_500</result>