A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

What happened when the wheel was invented?

Why Aeroplane windows are round?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.