Solve this riddle by finding the odd one out from the rest.

If eleven plus two equals one, what does nine plus five equal?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

Why is it very easy to weigh a fish?

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?

Spot the cat in the picture below

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Can you decipher the below rebus?

PBLUESAISNUERSES

What goes up but never comes down?