What goes up but never comes down?

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?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

What has 88 keys?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

What do you get if you add 2 to 100 four times?

What is the Surname of Barbie Doll?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?