Can you find the missing piece of the Porsche?

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?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Find the missing number in the image below.

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What will you call your mother's brother's brother-in-law?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Can you write down eight eights so that they add up to one thousand?

What does it mean?