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https://preparationpoint.info/mathematics-mcqs/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-hr/
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 ?
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