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Cross the Bridge

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1 Cross the Bridge on Mon May 03, 2010 9:56 pm

There are four people who can cross a bridge in 9 , 2, 5 and 1 min respectively. They need a torch to cross the bridge, the battery in the torch will last only for 17 min. How will all the four people cross the bridge.
Conditions:
1. Only two people can cross the bridge at one time.
2. They need to take torch along with them while crossing the bridge.

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2 Re: Cross the Bridge on Sun May 09, 2010 6:50 pm

is it really possible
i think it vil take 18 mins to cross d bridge

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3 Re: Cross the Bridge on Sun May 09, 2010 7:11 pm

let A be the src and B be the destination..

A -> B = ( 9 , 1) = 9 minutes..

B -> A = let 1 travel for 30 secs so that it reaches the middle of the bridge.Now he will ask 2 which is on the side A to cross the bridge by assisting him using the torch (direction A->B). now 1 will travel for another 30 secs to reach side A. Total minutes = .5 + 2 + .5 = 3

A -> B = (5,1) = 5 minutes..

Total time = 9 + 3 + 5 = 17 minutes..

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4 Re: Cross the Bridge on Sun May 09, 2010 7:35 pm

dats ridiculous

i can even say dat the torch was needed.
It wasnt specified dat only wen it is glowing one can cross d bridge

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5 Re: Cross the Bridge on Sun May 09, 2010 7:51 pm

unleashed wrote:dats ridiculous

i can even say dat the torch was needed.
It wasnt specified dat only wen it is glowing one can cross d bridge

Well, there is something called as common sense. I won't keep a torch just for fun. I would rather use it as a light source.

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6 @codecrcker on Sun May 09, 2010 8:29 pm

Well Buddy, the conditions are:
1)Two people have to walk together at a time to cross the bridge.
2)Out of the two people who are walking, one has to carry a torch which is glowing.

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7 @unleashed on Sun May 09, 2010 8:32 pm

Ok Buddy, this is definitely possible. If you try with multiple combinations, you will definitely arrive at solution. All the best

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8 @why not on Mon May 10, 2010 12:52 am

Suppose there are four person A,B,C,D such that A takes 1 min,B takes 2 min, C takes 5 min, D takes 9 min to cross the bridge.

So first A&B will go. so 2 min over.
Now B will come back with torch. 2 more min over.i.e totally 4 min over.
Now C&D will go. so 9 min over. i.e totally 13 min over.
Now A will come back torch.so 1 min over.i.e totally 14 min over.
Now A&B will go so 2 more min over.i.e totally 16 min over.

So, all of them had crossed the bridge in 16 min only. we have 1 min more in torch... Very Happy

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9 @Sneha on Mon May 10, 2010 1:09 am

Cool Sneha....Its a correct reply...Congrats

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10 Re: Cross the Bridge on Mon May 10, 2010 1:21 am

this was taught in softskills training prog @ NIE

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11 @chaitanya on Mon May 10, 2010 1:27 am

oh...that is great, then we should expect many more replies in this thread.

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12 Re: Cross the Bridge on Mon May 10, 2010 1:29 am

its better not to reveal the answer after someone posts it bec the others wont even try for it as u ppl r revealing if its correct ot not Sad

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13 @chaitanya on Mon May 10, 2010 1:33 am

We will take care of it buddy from next time.Only after we have had ample amount of discussion on the topic, we will reveal the correct answer.

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14 Re: Cross the Bridge on Mon May 10, 2010 1:37 am

thanks alot Smile really it helps us Smile because i have joined now and i want to ans some Q but already they have been answered by gr8 minds !!!I m posting my views for g.d pls check them and i will be happy if corrections are made!!!

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