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?

ill just call them the number of how long they take

10 goes with 7 with the first flash light - 10 min
5 goes with 1 with the second flash light - 5 min
1 goes back to 2 - 1 min
2 goes with 1 - 2 min

that makes it 18 minutes

Posted by anonymous on 2005-07-04 17:15:44