## How to cross the bridge in 17 minutes?

4 people who want to cross a bridge at night with a torch have to cross the bridge in the dark in 17 minutes

-Since the bridge cannot carry more than two people, it means that the bridge can be crossed by one or two people.

-To cross the bridge, a person must hold the torch in his hand (meaning one person must return the torch so the others can cross).

-The first person A takes 1 minute to cross the bridge.

-The second person B takes 2 minutes to cross the bridge.

-The third person C takes 5 minutes to cross the bridge.

-The fourth person D takes 10 minutes to cross the bridge.

How can these people cross the bridge in 17 minutes?