A 300-Kg Child Sits on One End of a Long Uniform

Multiple Choice

A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg,and a 40.0-kg child sits on the other end.The beam balances when a fulcrum is placed below the beam a distance 1.10 m from the 30.0-kg child.How long is the beam?

A) 2.12 m
B) 1.98 m
C) 1.93 m
D) 2.07 m
E) 2.20 m