What number should come in place of the question mark below?

If an electric train is travelling south, then which way is the smoke going?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Do You See It?

What can you hold in your right hand, but never in your left hand?

How can you make number one disappear by adding something to it?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Can you name some countries which do not have the alphabet 'A' in them?