Civil Service Exam Reviewer · Word Problems · hard
A pipe can fill a tank in 3 hours, while a drain can empty it in 6 hours. If both are open, how long will it take to fill the empty tank?
- 2 hours
- 6 hours
- 3 hours
- 4.5 hours
Answer
B. 6 hours
Solution
Net rate = 1/3 − 1/6 = 1/6 tank/hour → 6 hours.
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