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wo pipes X and Y fill a tank in 15 hrs. and 20 hrs. respectively, while a third pipe ‘Z’ can empty the full tank in 25 hrs. All the three pipes are opened in the beginning. After 10 hrs. Z is closed. In how much time, will the tank be full ? | |
A. | 12 hrs [Correct Answer] |
B. | 14 hrs [Wrong Answer] |
C. | 16 hrs [Wrong Answer] |
D. | 18 hrs [Wrong Answer] |