A water tank has two holes. The $$1^{st}$$ hole alone empti es the tank in 9 minutes and $$2^{nd}$$ hole alone empties the tank in 6 minutes. If water leaks out at a constant rate, how many minutes does it take if both the holes together empty the tank?

A

$$3\frac{3}{5}$$

B

$$\frac{3}{5}$$

C

$$3\frac{1}{5}$$

D

$$3\frac{2}{5}$$