# How much Time B will Take to Fill the Remaining Tank?

Pipe A can fill an empty tank in 6 hours and pipe B in 8 hours. If both the pipes are opened and after 2 hours pipe A is closed, how much time B will take to fill the remaining tank?

- 7/3 hours
- 15/2 hours
- 10/3 hours
- 12/5 hours

**Answer is (3): 10/3**

**Explanation:-**Pipe A can fill an empty tank = 6 hours

Therefore, A can an empty tank in an hour = 1/6

Pipe B can fill an empty tank = 8 hours

Therefore, B can fill an empty tank an hour = 1/8

Both pipe can fill an empty tank in 2 hours = 2(1/6 + 1/8)

= 2 (4 + 3)/24

= 2 x 7/24

= 14/24

The remaining empty tank = 1 – 14/24

= (24 – 14)/24

= 10/24

Then, time taken by B to fill the tank = 10 x 8/24

= 10/3 hours

Hence, the answer is (3) 10/3.