- A25
- B22.5
- C21
- D20
Step-by-Step Solution
In 5 minutes both fill 5 × (1/20 + 1/30) = 5/12 of the tank; remaining 7/12 is filled by B at 1/30 per minute in 17.5 minutes; total = 5 + 17.5 = 22.5 minutes.
Answer: B) 22.5
Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. Both are opened together, but pipe A is closed after 5 minutes. In how many minutes in total will the tank be filled? (answer in minutes)
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