Can you convert the number zero(0) into a positive number using just one mathematical operator ?

There are two insects on a tile. Insect X is sitting on one side of the tile (point A) and Insect Y is sitting opposite on the other side of the tile (point B). Now both of them decide to change their position and thus X starts crawling to point B and Y starts crawling to point A. When they meet and pass each other in between, X takes 20 seconds to reach B and Y takes just 5 seconds to reach A.

Can you calculate the total time each of the insects took to change their positions?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

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

The more of this there is, the less you see. What is it?

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

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

What has to be broken before you can use it?