Crossing Fast

Four men who are initially on the same side of the bridge have to cross in a least time. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them. The flashlight must be walked back and forth, it cannot be thrown, etc. Each band member walks at a different speed. A pair must walk together at the rate of the slower man's pace:
Bono: 1 minute to cross
Edge: 2 minutes to cross
Adam: 5 minutes to cross
Larry: 10 minutes to cross.
For example: If Bona and Larry walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission. Your goal is to get all the men across in 17 minutes or less.

Answer:

Bono (1min) and Edge (2min) walk across first bringing the total to 2 minutes. Then Bono (1) walks the flashlight back, total 3 minutes. Adam (5) and Larry(10) walk across, total 13 minutes. Edge (2) walks the light back, total 15 minutes. Edge (2) and Bono (1) walk across, total and answer 17 minutes.