The force exerted by each team is 30 N. The forces are in the direction opposite to each other.
Force exerted by team 1, [tex] F_{1}=30 N [/tex]
Force exerted by team 2,[tex] F_{2}=-30 N [/tex]
Net force, [tex] F=F_{1} +F_{2} [/tex]
[tex] =30+(-30)=0 [/tex]
Therefore, net force on the rope is 0 N.