Who knows the answers to these brain teasers?

[Cassbix]

Teaser #!

Four people are on one side of a bridge that they need to cross. It is
dark, there are holes in the bridge surface, and they only have one
flashlight which must travel with them as they cross. To add to their
troubles, the bridge will only support two people at a time.
* Now person #1 can walk cross in 1 minute.

* Person #2 has a limp and can cross in 2 minutes.

* Person #3 has a sprained ankle can cross in 5 minutes.

* Person #4 has a cast on his leg and takes 10 minutes to cross.


No matter how fast a person can cross, he must wait for his companion.
If #1 goes with #2, it takes 2 minutes for them to cross. If number #2
goes with #4, it takes them 10 minutes. The flashlight cannot be thrown,
instead it must be carried and delivered from person to person.



they must cross in 17 minutes before the battery dies. How do they do
it?

Teaser #2

Your job is to measure 45 minutes, if you have only two igniter cords
and matches to light the cords. The two igniter cords have the following
features:

They are twisted from various materials and also different parts can
burn at different speed (e. g. after ten minutes they will not burn at
the same point).
Every cord burns from ignition to the end exactly one hour.
Describe your way of measuring the 45 minutes.