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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 4 protistas on the run
Friday, July 29, 2005
Well, well, well, it seems that my comeback puzzle took you all quite a long time. I am disappointed!! MUAHAhahahaa.

So let's go back to nursery school with this next one. It's a classic.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


The gang of protistas is back, but only Omeali, Zygoe, Bengalii, and Yorz. In the dead of the night, these 4 have stolen some pennies and are on the run. To get home, they must cross a bridge that can only withstand the weight of 2 protistas at any time. As there is no moon out, they must cross with a flashlight. But, they only have 1 flashlight!! MUAhaHAHHAaa, foolish protistas.

Omeali can cross the bridge in 1 second, Zygoe in 2 seconds, Bengalii in 5 seconds, and Yorz in 10 seconds. When two protistas cross the bridge, they cross at the speed of the slower one.

What is the shortest time it will take all 4 protistas to cross the bridge? This time, your solution must include your logic.

Solved by Le_battement for 20 Protista Points.
9 Comments.


I believe the answer to be 19 seconds.
My logic is that Omeali holds the flashlight for each protista crossing the bridge.
He goes over the bridge first with Yorz [10 seconds], then goes over the bridge with the flashlight to fetch Bengalii [1 second]. They go over the bridge [5 seconds]. Omeali crosses the bridge this time to fetch Zygoe [1 second]. They cross [2 seconds].
All protistas have crossed the bridge in 19 seconds. 10+1+5+1+2=19
» invisible on 2005-07-29 01:36:02

re: Invisible
A noble try, but are you sure they can't cross any faster? MUAuahHAAHHAa.
» theLogicFiend on 2005-07-29 01:45:49

Perhaps this is flawed, but Omeali should just cross with Zygoe [2 seconds], and point the flashlight back at Yorz and Bengalii who cna walk straight towards it [10 seconds]. That's 12 seconds.
» le_battement on 2005-07-29 02:13:59

re: Le_battement
Another valiant effort. However, the reason 2 protistas travel at the speed of the slower one is because the protista can only navigate with the flashlight. This bridge can possibly be 100 miles long, and the flashlight beam is not that strong. Remember, protistas are very fast creatures. MUaahaHAHAHAHAa.
» theLogicFiend on 2005-07-29 02:21:49

question
Why do you need a flashlight if you're on a bridge? Why not walk just straight forward? Protistas aren't that dumb.
» flanger001 on 2005-07-29 02:47:16

Okay, so Omeali and Zygoe cross together with the dim, weak, pansy flashlight that couldn't out-shine a shoe (+2). Omeali crosses back with the flashlight (+1). He gives it to Yorz and Bengalii who then cross (+10). Zygoe brings it back (+2) and returns with Omeali (+2). Grand total = 17 seconds.
» le_battement on 2005-07-29 02:51:07

Re: Dave
There might be gaps in the planks that the bridge consists of. It's also pitch black out this night, and there are no side-railings.
» le_battement on 2005-07-29 02:53:25

Le_battement wins!!
Wow, 2 new additions to the hall of fame today! You scruffs are beginning to impress me. I guess I should increase the difficulty level.

re: Flanger
Better be safe than sorry. This bridge can be 1 inch wide, and 1 wrong step could result in a dead protista.
» theLogicFiend on 2005-07-29 02:56:18

omg
Le-battement...you beat me by 6 minutes
» little-b on 2005-07-29 02:58:17

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