- A10.5
- B8
- C4.2
- D20
Step-by-Step Solution
Net rate = 1/6 - 1/14 = (7 - 3)/42 = 4/42 = 2/21 sump per hour, so it is full after 21/2 = 10.5 hours.
Answer: A) 10.5
An inlet fills an empty sump in 6 hours and an outlet empties the full sump in 14 hours. If both are opened together on the empty sump, after how many hours will it be full?
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