Pipe "A" and "B" can fill a tank in 15 and 20 minutes respectively. How long would it take both pipes, working together to fill it?
Answer: 60/7 minutes
Explanation
Pipe A fills the tank in 15 minutes (rate = 151 per minute).
Pipe B fills the tank in 20 minutes (rate = 201 per minute).
Combined rate: 151+201=607 per minute.
Time taken together: 6071=760 minutes.
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