What does the below rebus riddle means?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

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?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

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

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?