Solution:

* First, the fireman and the athlete will go spending two minutes.
* The fireman will come back taking one minute.
* The drunk guy and the old lady will go spending five minutes.
* The athlete will come back taking two minutes.
* The athlete and fireman will go spending two minutes.

Two + One + Five + Two + Two = Twelve.

Thus all of them will be out of the house before it collapses.

Solution:

192 021

If you look at it as two-digit numbers you'll see:10 11 12 13 14 15 16 17 18 19 20 21

Solution:

Solution is shown in image below

Solution:

The ball will take infinite bounces before it is stopped. As per the question it will keep on bouncing half way up every time it hits the ground. But gravity will play its part at certain point of time which will make it stop.

Solution:

2 minutes (duration between 9:59 and 10:01)

Solution:

In the picture you can find the green matchsticks. We have moved them from the bottom and placed them in the middle. It was a bit tricky but now you have your desired result.

Solution:

Treasure Map Is Hidden Inside The Hanging Room Floor.

Explanation.
Just reverse the text "roolF mooR gnignaH ehT edisnI neddiH sI paM erusaerT".

Solution:

In the corners of the square, tighten two ropes. Tighten another rope between them by putting rings on each rope. That rope should be tightened on the sheep's neck on the other end.

Solution:

Pages 19, 20, 23, 37, 38, & 42 will also be missing

Solution:

See the figure for the answer. Wasn't it a bit tricky?

Solution:

The Stars