Two liquids A & B form an ideal solution. What is the vapour pressure of solution containing 2 moles of A and 3 moles of B at 300 K? [Given : At 300 K, Vapour pr. of pure liquid A(P) = 100 torr, Vapour pr. of pure liquid B(PO )= 300 torr ] (A) 200 torr (B) 140 torr (C) 180 torr (D) None of these