Given 01 = 30, 02 = 60, and a lantern's mass is 2.1 kg, find f1, f2, and f3.
a) f1 = 30, f2 = 60, f3 = 120
b) f1 = 15, f2 = 30, f3 = 45
c) f1 = 60, f2 = 90, f3 = 120
d) f1 = 90, f2 = 120, f3 = 150