Challenge 102

Serginho crossing the bridge

Difficulty level:

Serginho Trickster had to cross a bridge every day to date Roberleia. One day there was a policeman halfway across the bridge, not letting anyone cross. Whenever the cop saw someone trying to cross, he would send the person back.

Serginho noticed that the policeman slept a minute and stayed awake another. Knowing that it took two minutes to cross the bridge, as Serginho did to cross it?

* challenge submitted by user Diego Cavalcante de Sousa.