On a map with a scale of 1:60000000, the distance between A and B is 2.5 cm. A plane takes off from A at 1:30 p.m. and arrives at B at 2:45 p.m. How many miles per hour.
在比例尺是1：60000000的地图上，量得甲、乙两地的距离为2.5厘米，一架飞机下午1时30分从甲地起飞，下午2时45分到达乙地，这架飞机平均每小时飞行多少千米．
<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>