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

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

Imagine you are in a room with no windows or doors. How will you get out?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What word is pronounced the same if you take away four of its five letters?

What kind of band never plays music?

Count the squares in the matchstick puzzle below?

What does this mathematical rebus means ?