What does this rebus puzzle means ?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

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

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

What does a man do only once in his lifetime, but women do once a year after they are 29?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?