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. \xa0All the three pipes are opened in the beginning. \xa0After 10 hrs. Z is closed. \xa0In how much time, will the tank be full ?

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A.\xa012 hrs

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. \xa0All the three pipes are opened in the beginning. \xa0After 10 hrs. Z is closed. \xa0In how much time, will the tank be full ?

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