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?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

What number divided by 4 is the same as that number minus 4?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

There are forty elephants and they have forty-fore heads. How can this be possible?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?