Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

What is the centre of gravity?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

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

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

Buy me, smell me or deliver me, I do not change.

Who am I?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Which number comes next in the number series?

2, 9, 30, 93, ?

What jumps when it walks and sits when it stands?