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Two pipes A and B can fill a tank in 15 hours and 20 hours respectively while a therd pipe C can empty the full tank in 25 hours. All the three pipes are opened in the beginning. After 10 hours, C is closed. Now how much time more is required to fill the tank? |
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Answer» 2 hrs in `(10+T)` hours + part filled by B in `(10+T)` hours + part empty by C in 10 hours = 1 ` RARR (T+10)/15 + (T+10)/20 - 10/25 = 1 rArr T = 2 hrs` |
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