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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: A
Correct Answer: A
Method / Topic: Pipes and Cisterns
The answer uses the net filling rate.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Pipes and Cisterns
The inlet rate is 1/10 and the outlet rate is 1/15 tank per hour. Net rate is 1/30, so time is 30 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.
An inlet fills a tank in 10 hours and an outlet empties it in 15 hours. How long will the tank take to fill when both are open?
Explanation
Correct Answer: A
Method / Topic: Pipes and Cisterns
The answer uses the net filling rate.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Pipes and Cisterns
The inlet rate is 1/10 and the outlet rate is 1/15 tank per hour. Net rate is 1/30, so time is 30 hours.
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