Four men want to cross a bridge. They all begin on the same side. It is night, and they only have one flashlight with them. At most two men can cross the bridge at a time, and any party who crosses, either one or two people, must have the flashlight with them.
The flashlight must be walked back and forth: it cannot be thrown, etc. Each man walks at a different speed. A pair must walk together at the speed of the slower man.
Man 1 needs 1 minute to cross the bridge, Man 2 needs 2 minutes, Man 3 needs 5 Minutes, and man 4 needs 10 minutes. For example, if man 1 and man 3 walk across together, they need 5 minutes.
The question: How can all 4 men cross the bridge in 17 minutes?
2007-04-02 03:51:00 · 4 answers · asked by Sunny_1_ 3 in Entertainment & Music ➔ Jokes & Riddles
They all get in the car and drive.....
Man one crosses with man two, man one returns (total time three minutes) man three crosses with man four, man two returns (total time twelve minutes), man one and two cross (two minutes)....total bridge crossing time 17 minutes
2007-04-02 04:02:41 · answer #1 · answered by kerfitz 6 · 0⤊ 0⤋
First - the 10 Min man and 1 Min Man walk. 1 min Man walks back. - 11 Mins total. Then 2 min Man and 5 Min man walk over - 16 Mins Total. Everyone has walked over bridge in 16 Mins- It never says they all have to be on other side - just that they crossed bridge!
2007-04-02 11:07:04 · answer #2 · answered by Steve K 1 · 0⤊ 0⤋
1. #2 walks #1 across in 2min.
2. #1 returns in 1 min.
3. # 4 walks #3 across in 10 min.
4. #2 returns in 2 min.
5 #2 walks # 1 across in 2min.
total time is 17 mon. and steps 2 and 4 are interchangable. The point is to have 4 and 3 across and have a faster walker waiting on the other side...Hope this helps...
2007-04-02 11:07:50 · answer #3 · answered by Lids 5 · 1⤊ 0⤋
what kind of bridge has stupid rules like that!
2007-04-02 13:42:52 · answer #4 · answered by Anonymous · 0⤊ 0⤋