Discuss Forum
1.
Pipe A alone can fill a tankin 8 hours .Pipe B can fill it in 6 hours . If both the pipes are operated and after 2 hours pipe A is closed, then the other pipe will fill the tank in.
- A. 6 hours
- B. 6 hours
- C. 6 hours
- D. 6 hours
Answer: Option D
Explanation:
Part of the tank filled by pipe A and B in 2 hours = 2 ( 1/6 + 1/8 ) = 2 {(4 + 3)/24} = 7/12 Remaining part = 1 - 7/12 = 5/12 This part is filled by pipe B. ∴ Required Time = (5/12)x 8 = 10/3 hours
Post your comments here: