John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

The centre of the third figure is empty. What digit should fit inside?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

When is the top of a mountain similar to a savings account?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

What is always in front of you but can’t be seen?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

The more it dries, the wetter it becomes. Can you tell what it is?