- A9 min
- B4 min
- C6 min
- D10 min
Step-by-Step Solution
A in 5 min: . Together: per min, so takes 4 min. Total = 9 min.
Answer: A) 9 min
Pipe A fills a tank in 15 minutes and pipe B in 10 minutes. A runs alone for the first 5 minutes, then B is also opened. How long does the whole filling take?
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