- A3.6
- B7.5
- C4
- D3
Step-by-Step Solution
Combined rate = 1/9 + 1/6 = 2/18 + 3/18 = 5/18 tank per hour, so time = 18/5 = 3.6 hours.
Answer: A) 3.6
Two inlet pipes feed a village water tank. The first can fill it alone in 9 hours and the second alone in 6 hours. How long (in hours) will they take running together?
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