- A15 min
- B12 min
- C17 min
- D13 min
Step-by-Step Solution
If it takes min: . (12 min is the time with both open throughout.)
Answer: A) 15 min
Pipes A and B fill a tank in 20 and 30 minutes. They are opened together, but A is shut 5 minutes before the tank is full. How long does the filling take?
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