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

What does this rebus puzzle means ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

You are given a set of weighing scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other. The 12 marbles appear to be identical. 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more. Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Spot the cat in the picture below

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Name a key which is hardest to turn.

What number should come in place of the question mark below?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?