Can you move 2 matchsticks to form four equal sized squares.

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

The more you take me, the more you leave me behind.
Who Am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

Give it food and it will live; give it water and it will die.

Can you find out the remainder when 3^300 is divided by 5?

What is harder to catch the faster you run?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

Count the squares in the matchstick puzzle below?