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Two pipes P and Q can fill a tank in 6 hrs. and 4 hrs. respectively. If they are opened on alternate hours and if pipe P is opened first, in how many hours, the tank shall be full ? | |
A. | 3 hrs [Wrong Answer] |
B. | 4hrs [Wrong Answer] |
C. | 5 hrs [Correct Answer] |
D. | 6 hrs [Wrong Answer] |