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?

How can you tell a raw egg from a hard-boiled egg?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

There are 3 apples in the basket and you take away 2. How many apples do you have now?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

10+10 and 11+11 can give you the same answer.

Explain how?

What can you serve, but never eat?