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Five People on Two Bridges (Posted on 2005-06-25) Difficulty: 2 of 5
In the puzzle Four people on a Bridge we met four people who needed to cross a bridge at night. In this puzzle, there are five people who must cross two sequential bridges at night. As in the original puzzle, there are some hindrances:

The bridges can only support two people crossing at a time.

Each person has a different speed in which they can cross: 10 minutes, 7 minutes, 5 minutes, 2 minutes, and 1 minute.

They have only two flashlights to share among them.

What is the shortest amount of time it will take for all five people to cross both bridges?

See The Solution Submitted by Erik O.    
Rating: 3.8000 (5 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Some Thoughts solution | Comment 24 of 41 |
I think that if you have the person who takes 10 min walk across one bridge with the person who takes 7 min that in the 7 min it takes the other one will still have two min left to walk so have the person who takes 2 min walk across when the 7 min person gets off then they will have crossed at the same time and on the other bridge the person who takes 5 min an the person who takes 1 min should start crossing so within the 5 min it takes for the 5 min person to walk across the other 2 people (7min an 10 min people) will still be walking so it should only take 10 min for each person to be across the bridges.
  Posted by Awdreye on 2005-06-28 07:20:57
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