17(x+24)/6=y

3(x-24)=y

The solution is x=840.

y=2448

So when there is no wind, the speed is 840 kilometers per hour.

The voyage is 2448 kilometers.

2, let x, y

6y+3=x

8y=x+5

X=27，y=4。

So there are 27 pigeons and 4 cages.