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Mathematical problems about flight
hello

It takes seven days for wild ducks to fly from the South China Sea to the North Sea. It is known that the flying speed of wild ducks is one day 1/7 units.

Geese can fly one-third of the whole journey from the North Sea to the South China Sea in three days, which shows that the flying speed of geese in one day is 1/9 units.

When they meet, the sum of their distances is exactly the whole journey, that is, the unit is 1, so the meeting time = the sum of distances/speed.

That is,1÷ (1/7+1/9) = 63/16 days.

Thank you for your adoption!