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

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

Who am I?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Can you solve the below geography rebus by decoding the below rebus ?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

What is the longest word in the dictionary?

What jumps when it walks and sits when it stands?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?