Move four matchsticks to the below square to form three squares?

What does this rebus mean?

O
N
C
E
TIME

What is the word or phrase below?
R | E | A | D

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

10+10 and 11+11 can give you the same answer.

Explain how?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

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?

You need to move three matchsticks to form three squares. Can you do it?

What is the Surname of Barbie Doll?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?