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