QUICLY PLEASE HELP ME

For the composite wall represented in the attached figure, assuming a unidirectional heat transfer and knowing that: Area A = 1 ft? Area B = Area E Area C = Area D=2 Area E = = KA = 100 BTU/br.ft.E KC = 60 BTU/hr.ft.E KE = 80 BTU/hr.ft.E Calculate the heat flux KB = 20 BTU/hr.ft.E KD = 40 BTU/hr.ft.E KF = 100 BTU/hr.ft.E 4 puig A 8 puta B 00 E D 2 pulo 2 puig F