I’m tall when I’m young, and I’m short when I’m old. What am I?

Find the value of "?" in the ball picture Riddle below:

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?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

What goes up but never comes down?

What is the longest word in the dictionary?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

John was piloting a plane behind a car but was never able to overtake it. Why?