The fuel carried by an airplane can be used for up to 4 hours. If the airplane flies out of the wind and flies 1500km per hour, and when it flies back against the wind, it flies 1200km per hour. How many kilometers should the airplane fly back after flying out?
一架飞机所带的燃料最多可以用4小时，如果飞机飞出顺风，每小时飞1500km，飞回时逆风，每小时飞1200km，这架飞机最多飞出多少千米后应该往回飞．
<gadget id="calculator">80_000 / 3</gadget>
<output>80_000/3 = around 26_666.666667</output>

<result>80_000/3 = around 26_666.666667</result>