Three brothers A, B and C together purchased a car of worth 2, 40,000 Rs. Mr. A contributed 1/2 of the total amount contributed by the other two brothers. Mr. C contributed 1/3 of the total amount contributed by the other two brothers. Find the contribution made by Mr. B.
Rs. 80,000
Rs. 1,20,000
Rs. 60,000
Rs. 1,00,000