- A4.5
- B4
- C6
- D5
Step-by-Step Solution
Combined rate = 1/15 + 1/20 = 7/60; in 6 min = 42/60 = 7/10 filled. Remaining 3/10 at A's rate 1/15 → (3/10) × 15 = 4.5 minutes.
Answer: A) 4.5
Two pipes A and B can fill a tank in 15 and 20 minutes respectively. Both are opened together, and after 6 minutes pipe B is closed. How long will pipe A take to fill the rest of the tank? (answer in minutes)
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