Form teams of 2 or 3 and solve the following puzzle:

Four people come to a bridge. The bridge can hold only two people at a time, and the group has only one flashlight that must be used to cross the bridge. Once two peole get across, one must bring the flashlight back. Each person walks at a different speed and the slowest person dictates the speed with which two people will be able to cross. Person 1 crosses in 1 minute, person 2 crosses in 2 minutes, person 3 crosses in 5 minutes, and person 4 crosses in 8 minutes. How fast can all four people get across the bridge?