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

B. 18 hrs

C. 14 hrs

D. 16 hrs

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