Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

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?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

What can you hold in your right hand, but never in your left hand?

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

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

What is the Surname of Barbie Doll?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?