1.
Actually, there are two parts.
The bottom of each wheel is in contact with the road and not slipping,
so it must be moving the same speed as the road.
2. 1
and 1, or 1 and any other number.
3.
2,520.
4.
It can’t fly on the moon, because there is no air on the moon.
5.
17 geese and 32 sheep.
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