On a map with a scale of 1:40000000, the measured distance between A and B is 15 cm. It takes 8 hours for a plane to fly from city A to city B, how many kilometers does the plane fly per hour?
在比例尺1：40000000的地图上，量的甲乙两地距离是15厘米．一架飞机从甲城飞往乙城用了8小时，这架飞机每小时飞行多少千米？
<gadget id="calculator">1 / 40_000_000</gadget>
<output>1/40_000_000 = around 0</output>

<gadget id="calculator">15 / (1/40_000_000) / 100_000 / 8</gadget>
<output>750</output>

<result>750</result>