Engineering Board Exam Reviewer · Work Problems · medium
One pipe can fill a tank in 5 hours and another in 8 hours. A drain can empty the full tank in 10 hours. With all three open, how many hours will it take to fill the empty tank?
- 2.35 h
- 3.08 h
- 5 h
- 4.44 h
Answer
D. 4.44 h
Solution
Net rate: 15+ 18- 110=8+5-4/40=9/40 of the tank per hour. Time =40/9 4.44 hours.
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