If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

I have branches, but no fruit, trunk or leaves. What am I?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Solve the mathematical equation in the picture below.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What has one eye, but can’t see?

Akbar summoned Birbal out of anger.
He told him that he will have to face death.
He asked him to make a statement and if the statement is true he will be buried alive and if the statement is false, he will be thrown at lions.
After hearing Birbal’s statement, Akbar could do nothing but smile.
He gave him 5 gold bars and let him go.

What did Birbal say?

How can you drop a raw egg from a height onto a concrete floor without cracking it?