A man plots the murder of his wife. His plan is full proof. Nobody saw them leaving their house. He stabbed her with a knife while driving. She died on the spot. He threw her body in a valley. He threw the knife carefully wiping his finger prints on a random garbage bin. Then he went back to his home and no one was watching him this time as well.

After an hour, he was called by the local police department who informed him that his wife was murdered. They asked him to reach the scene of crime immediately. But as soon as he arrived at the crime scene, he was arrested by them.

How did the police know that he himself is the murderer?

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?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Which number should replace the question mark?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Who can jump higher than a Mountain?

By what process could you make a 'Tea-Table' into food?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Can you name an animal whose killing cannot be performed without spilling your own blood?