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?

How could a baby fall out of a twenty-story building onto the ground and live?

If 1+9+8=1, what is 2+8+9?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

How many times can you subtract the number 5 from 25?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Count the squares in the matchstick puzzle below?