If it took eight men ten hours to build a wall, how long would it take four men to build it?

Replace the question mark with the correct number in below Picture:

Which point will the car reach to go out?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Can you count the number of triangles in the given figure?

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

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?

Find the next number in the series.
1 10 24 43 67 ?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?