The ratio of the income of A and B is x : y. When the income of A is increased by 20% and the income of B is decreased by 40%, then the ratio of the income of A and B becomes of A and B becomes 5 : 6. What is the value of \(\rm {3x + 2y \over 5x-y}\) ?
1
\({7 \over 9}\)
2
\({1 \over 5}\)
3
\({5 \over 2}\)
4
3