1 . 3 pumsps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the same tank in 1 day?
- A. 9 hours
- B. 10 hours
- C. 11 hours
- D. 12 hours
- D. None of these
View Answer | Discuss in Forum | Workspace | Report |