What is common among 11, 69, and 88?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Why Aeroplane windows are round?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

What has lots of eyes, but can’t see?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Can you replace the question mark with the correct number?

You need to remove two matchsticks to make the below equation true. Can you do it ?