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- Find each pipe's rate.
- Add filling rates and subtract emptying rates.
- Invert the net rate to get time.
Correct Answer: D
Correct Answer: D
Method / Topic: Pipes and Cisterns
The answer uses the net filling rate.
Short Explanation
Detailed Explanation
Correct Answer: D
Method / Topic: Pipes and Cisterns
Net rate = 1/6-1/12 = 2/12-1/12=1/12 tank per hour. Therefore, time = 12 hours.
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Find each pipe's rate.
- Add filling rates and subtract emptying rates.
- Invert the net rate to get time.
A pipe fills a tank in 6 hours, while an outlet empties it in 12 hours. If both are opened together, how long will the empty tank take to fill?
Explanation
Correct Answer: D
Method / Topic: Pipes and Cisterns
The answer uses the net filling rate.
Short Explanation
Detailed Explanation
Correct Answer: D
Method / Topic: Pipes and Cisterns
Net rate = 1/6-1/12 = 2/12-1/12=1/12 tank per hour. Therefore, time = 12 hours.
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