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?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

What building has the most stories?

What kind of tree can you carry in your hand?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

What has one letter and starts with an E?

What month of the year has 28 days?

Find the next number in the series.
1 10 24 43 67 ?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?