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 have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

81 x 9 = 801. What must you do to make the this equation true?

How many times can you subtract the number two from the number fifty?

How can you make number one disappear by adding something to it?

When does a USA Potato change its nationality?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

You need to arrange three 7 and mathematical symbols to form number 1?