What does this rebus riddle means ?

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 Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Which number comes next in the number series?

2, 9, 30, 93, ?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Make a sentence consisting of three words that have the whole alphabet.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?