A tap can fill a tank in $$5\frac{1}{2}$$ hours. Because of a leak, it took $$8\frac{1}{4}$$ hours to fill the tank. In how much time (in hours) will the leak alone empty 30% of the tank?

A

$$\frac{99}{20}$$

B

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

C

$$\frac{9}{2}$$

D

$$\frac{17}{2}$$