Tap A and Tap B can fill a tank independently in $$3 \frac{1}{2}$$ hours and $$4 \frac{1}{2}$$ hours respectively. Tap A is opened at 6:00 AM. After that tap B is opened at 7:10 AM. then the time at which tank will be full of water is

A

8:30 AM

B

8:30 $$\frac{1}{2}$$ AM

C

8:30 $$\frac{1}{4}$$ AM

D

8:30 $$\frac{3}{4}$$ AM