The fuel carried by an aircraft can be used for up to 9 hours. When the aircraft goes downwind, it can fly 1500 kilometers per hour; when it returns to headwind, the flight distance per hour is downwind (4/5). How much does this aircraft fly? Kilometers should fly back? (column equation solution)
一架飞机所带的燃料最多可以用9小时，飞机去时顺风，每小时可飞1500千米；返回逆风，每小时飞行的路程是顺风飞行的(4/5)，这架飞机飞出多少千米就应往回飞？(列方程解答)
<gadget id="calculator">1_500 * 4</gadget>
<output>6_000</output>

<result>6_000</result>