[WillowTheWhisp]

The hole is round for the reason Dave said. If you had a square hole with a square cover and the cover was turned on it's side diagonally it would fall down the hole because the diagonal of the hole is longer than the side of the square lid. No matter which way you you turn a circular cover it is exactly the same shape with the same length diameter and so cannot fall into the hole.

The weather is bloomin cold because you would have to be at the north pole. If you look at a globe you'll see that all the lines of longitude converge at the poles. If you start at the pole and walk south (it really doesn't matter how far) then turn in any direction and walk along as far as you like then turn north again and walk exactly the same distance that you walked south you will end up at the north pole again. Because the questioner tells you that you have ended up at your starting point you must have started from the north pole as this is the only place on earth where you can do this. (If you walked north, then east or west and then south you would be at the south pole) And the weather at the north pole is a bit on the chilly side.

The third question does seem to be a trick question though because although there is indeed logic in the reasoning that people go up in droves and down in trickles I'm suspicious of the question itself because there is no such thing as an 'up' or 'down' escalator. There are just escalators and if there are 3 of them then 2 can be set to go up and one set to go down but equally all 3 could be set for up if they want to evacuate the station more quickly.

See, I'm living up to my reputation as a waffler again.