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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
Combined hourly rate = 1/20+1/30=1/12. In 6 hours, filled fraction = 6×1/12=1/2.
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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.
Two pipes fill a tank in 20 hours and 30 hours. What fraction of the tank will they fill together in 6 hours?
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
Combined hourly rate = 1/20+1/30=1/12. In 6 hours, filled fraction = 6×1/12=1/2.
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