- A4.5
- B3
- C6
- D4
Step-by-Step Solution
In 9 hours X fills 9/12 = 3/4 of the tank. Y must fill 1/4, which takes hours.
Answer: A) 4.5
Pipe X fills a tank in 12 hours and pipe Y in 18 hours. Both are opened together, but Y is turned off after some time, and the tank is full in exactly 9 hours. For how many hours was Y open?
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