A man was just doing his job when his suit was torn. Why did he die three minutes later?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Name a key which is hardest to turn.

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

I cannot talk, but I always reply when spoken to. What am I?