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

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Can you count the number of matches in the picture below ?

A man is approaching a broad and barren land. He has a package with him. If somehow, he is unable to open the package before reaching the land, he will die.

Can you guess what is present in the package?

What is always in front of you but can’t be seen?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

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.

People make me, save me, change me, raise me. What am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?