Which Travels Faster? Solve below famous picture riddle:

What's the only room from which no one can enter or leave

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?

Name a key which is hardest to turn.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

I have no life, but I can die. What am I?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?