If you say my name, I will no longer exist. What am I?

By adding four matchsticks, can you divide the square shown in the picture into two equal parts?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Solve this riddle by finding the odd one out from the rest.

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

How can you leave a room with two legs and return with six legs?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

Can you tell a 3D object that has just two surfaces?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?