Destiny Math Teaser

A Vandal can cross a bridge in 10 minutes. A Captain can cross the same bridge in 5 minutes. A Dreg can cross the bridge in 2 minutes and it only takes the Shank 1 minute to cross the bridge. All four are on one side of the bridge and can only cross NO MORE THAN two at a time. They are crossing at night so they need a flashlight. Each time two cross someone has to go back with the flashlight. They have 17 minutes to cross the Bridge before the Guardian come to kill them. In what order do they cross? There is one and only one way to do this. [i]Proud member of the clan causing a sensation [url=http://www.bungie.net/en/Forum/Post/67123219/0/0] THE GRIMGUARD[/url] .[/i]