There was once an empty room with nothing inside but walls and a huge hole on the top of the ceiling. Water started coming out of the hole filling the room.
During the first 5 minutes... the height of the water is only 1cm,
and in the next 5 minutes... the height of the water is doubled, 2 cm. Another 5 minutes... the height is again doubled, which is 4 cm. The next 5 minutes... guess what? The height is 8 cm...
and.. so on...
After a full 100 minutes... the room is totally filled with water.
How long does it take for ONLY HALF of the room to be filled with water? Answer in how many minutes and why.
Note: We don't know the height of the room.
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Last Weeks Riddle Answer:
First, the waiter stuck the match into the lemon wedge, so that it would stand straight. Then he lit the match, and put it in the middle of the plate with the lemon. Then, he placed the glass upside-down over the match. As the flame used up the oxygen in the glass, it created a small vacuum, which sucked in the water through the space between the glass and the plate. Thus, the waiter got the water into the glass without touching or moving the plate.
This Weeks Quote...