If it took eight men ten hours to build a wall, how long would it take four men to build it?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

When we see 2 but call 10?

Why is the Hole below a Lock?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

Find the next number in the series.
1 10 24 43 67 ?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Count the number of lines in the image below ?

Can anyone tell me a word in the English dictionary which has a silent 'z'?