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?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

Before Mount Everest was discovered, what was the highest mountain in the world?

There is a place where if I stand up straight, I will still be considered sideways.

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

You can see three almost identical images below. Can you spot the odd one out from them?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS