What has a ring but no finger?

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?

What came first, the chicken or the egg?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

I make two people out of one. What am I?