- AAfter 60 minutes
- BAfter 54 minutes
- CAfter 30 minutes
- DAfter 55 minutes
Step-by-Step Solution
Each pair adds . After 27 pairs (54 min) it is full; A's next minute adds .
Answer: D) After 55 minutes
Pipe A fills a tank in 10 minutes and pipe B empties it in 15. They are opened alternately for 1 minute each, A first. When is the empty tank full?
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