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If two pipes function together, the cistern will be filled in 6 hrs. One pipe fills the cistern 5 hrs. faster than the other. How many hours it take the second pipe to fill the cistern? | |
A. | 5 hrs [Wrong Answer] |
B. | 10 hrs [Wrong Answer] |
C. | 15 hrs [Correct Answer] |
D. | 20 hrs [Wrong Answer] |