Answer to puzzle of crossing the bridge

Here is the answer:

1. Bono & Edge cross & Bono returns 3 min. (2 speedy Gonzales cross and one brings back the flashlight)

2. Adam & Larry cross & Edge returns 12 min. (2 slow pokes cross and let the speedy Gonzales on the other side to bring back the flashlight)

3. Bono & Edge cross 2 min. (both speedy gonzales cross together again)

Total 17 min.

Isn't it simple?

Alec