A and B started a partnership business investing some amount in the ratio of 3 : 5. C joined then after six months with an amount equal to that of B. In what proportion should the profit at the end of one year be distributed among A, B and C?
3 : 5 : 2
3 : 4 : 5
6 : 10 : 5
Data inadequate
3 : 5 : 5