A boy and a girl are balanced on a massless seesaw. The boy has a mass of 60 kg and the girl's mass is 50 kg. If the boy sits 1.5 m from the pivot point on one side of the seesaw, where must the girl sit on the other side for equilibrium?
a. 2.5 m
b. 1.8 m
c. 1.2 m
d. 1.3 m
e. 3.0 m
