1 . A water tank is two-fifth full. Pipe A can fill a tank on 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely ?
- A. 6 min to empty
- B. 6 min to fill
- C. 9 min to empty
- D. 9 min to fill
View Answer | Discuss in Forum | Workspace | Report |