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How to do the sixth problem of Tianfu Mathematics P58 published by China Normal University in the next issue of Grade 7?
No more than 9 hours and no more than 9 hours, which means the longest flight time is 9 hours.

When walking, it is downwind, and the speed is: 800+100 = 900 km/h.

The return time is against the wind, and its speed is: 800-100 = 700 km/h.

If the distance is fixed, then the speed ratio should be proportional to the distance ratio.

Then go: 900x(700/900+700)x9=3543.75.

Time: 700x(900/900+700)x9+3543.75.

If the verification is successful, then the plane should fly back when it flies out of 3543.75 kilometers at most.

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