What does this rebus means ?

PROG WORKRESS

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Replace the question mark with the correct number in below Picture:

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
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The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

What does this rebus mean?

O
N
C
E
TIME