Two liquids 'A' and 'B' form an ideal solution. At 300K, the vapour pressure of a solution containing 1 mol of A and 3 mol of B is 550 mm Hg. At the same temperature if one more mole of B is added to this solution, the vapour pressure of the solution increases by 10 mm Hg. Determine the vapour pressure of 'A' and 'B' in their pure states.