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

What does this rebus riddle means ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A father's child, a mother's child, yet no one's son.

Who am I?

Four children having five rocks each were playing a game in which they had to throw the rock at a particular solid area in the water. Child 1- Succeeded in throwing three rocks at a solid area but one of the rocks sunk. Child 3 - His aim was so bad that all rocks got sunk. Child 4- He was awesome and none of the rocks got sunk. Child 2 - Was the winner but was struck by a rock in the head and died. Who killed Child 2?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

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?

You need to remove two matchsticks to make the below equation true. Can you do it ?