Can you spot the man between the coffee bean in the picture below ?

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?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Which is the smallest number that you can write using all the vowels exactly once?

Can you find the mistake in the below statement?

What is the word or phrase below?
R | E | A | D