Which tank will fill first?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

I have no life, but I can die. What am I?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What part of the chicken has the most feathers?

What does an Island and the letter T have in common?

What is black when you buy it, red when you use it, and gray when you throw it away?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Find the missing letter in the last circle logically in the given below picture.