There are two teams of two people each competing in a relay race. The race is for 1km, and each member of a team has to run 500 meters

Benedetta and Elena are in one team, and the Silvia twins form the second team.

Benedetta can run 500 meters in

minutes.

Elena can run 500 meters in

minutes.

Each of the Silvia twins can run 500 meters in

minutes.

Which pair will win the race and by how much time?