- A6
- B4
- C8
- D5
Step-by-Step Solution
P works all 20 minutes: 20/24 = 5/6 of the tank. Q fills the remaining 1/6, which takes 36/6 = 6 minutes.
Answer: A) 6
Pipes P and Q fill a tank in 24 minutes and 36 minutes respectively. Both are opened together, Q is shut after a while, and the tank is full in exactly 20 minutes. After how many minutes was Q shut?
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