- A54
- B18
- C81
- D40.5
Step-by-Step Solution
Net rate = 1/27 − 1/54 = (2 − 1)/54 = 1/54 of the tank per hour, so it is full after 54 hours. (18 h would be the time if both pipes were filling.)
Answer: A) 54
An inlet fills a godown's water tank in 27 hours, while an outlet drains the full tank in 54 hours. If both are kept open from empty, after how many hours is the tank full?
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