Two liquids A and B form ideal solution. At 300 K, the vapour pressure of a solution containing 1 mole of A and 3 molcs of B is 550 mm of Hg. At the same temp., if one more mole of B is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. What is the the v.p. of A & B respectively in their pure states. (a) 400, 600 (b) 600, 400 (c) 700, 100 (d) 100, 700