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Logic Puzzles by The Logic Fiend
Good day my lamebrained friend. Be addled by my riddles. You may be rewarded or punished for your answers. So beware!

The 5 protistas on the run
Friday, July 29, 2005
After crossing the bridge [refer to previous puzzle], the 4 hairy protistas meet up with their gangmate Mortopejia. Mortopejia has another flashlight and tells the others that there are 2 more (identical) bridges ahead.

The sames rules as before [refer to previous puzzle] apply. It will take Mortopejia 7 seconds to cross a bridge. There is some ground between the 2 bridges, but the distance between the 2 bridges is insignificant compared to the lengths of the bridges.

What is the shortest time it will take all 5 protistas to cross the 2 bridges ahead?

Solved by Invisible for 25 Protista Points.
6 Comments.


30 minutes.. Can be done faster, I know.
[1] [2] [5] [7] [10] -------- ( ) --------

After 5 minutes
[1] [7] [10] -------- ( [2f][5] ) --------

+1 minute
[7] [10] ----[2f]---- ( [1f][5] ) --------

+1 minute
[2] [7] [10] -------- ( ) ----[1f][5]----

+4 minutes
[2] ----[7f][10]---- ( ) -------- [1f][5]

+6 minutes
[2] -------- ([7f][10] [1f]) -------- [5]

+1 minute
[1f][2] -------- ( ) ----[7f][10]---- [5]

+2 minutes
-------- ( [1f][2] ) ----[7f][10]---- [5]

+8 minutes
-------- ( [1f][2] ) -------- [5] [7] [10]

+2 minutes
-------- ( ) -------- [1] [2] [5] [7] [10]
» le_battement on 2005-07-29 03:37:29

I didn't catch the last part - two bridges.
drat.
» invisible on 2005-07-29 04:47:33

I thought I was in the other post.
so nevermind the previous comment.

I will be back with an attempt of an answer.
» invisible on 2005-07-29 04:51:14

Here is my answer : 27 seconds
Z M Y -------- O B -------- = 5
Z ----M Y---- -------- O B = 5
Z ----M Y---- O -------- B = 1
Z -------- M Y O -------- B = 4
Z O -------- ----M Y---- B = 1
-------- Z O ----M Y---- B = 2
-------- Z O -------- M B Y= 7
-------- -------- Z O M B Y= 2

» invisible on 2005-07-29 05:48:55

[same as above, but reformatted for easier reading]
Z O M B Y -----------     -----------
Z   M   Y ----------- O B ----------- = 5
Z         ----M Y----     ----------- O B = 5
Z         ----M Y----  O  ----------- B = 1
Z         ----------- MYO ----------- B = 4
Z O       -----------     ----M Y---- B = 1
Z O       ----------- Z O ----M Y---- B = 2
          ----------- Z O ----------- M B Y = 7
          -----------     ----------- Z O M B Y = 2

» invisible on 2005-07-29 07:03:48

Invisible is the winner!
Well, well, well, another one to the hall of fame. It's time for a real challenge. MUAhAHhaHAHAAHha.
» theLogicFiend on 2005-07-30 09:05:16

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