Two pipes can fill a tank in 15 hours and 20 hours respectively, while the third can empty it in 30 hours. If all the pipes are opened simultaneously , the empty tank will be filled in

Two pipes can fill a tank in 15 hours and 20 hours respectively, while the third can empty it in 30 hours. If all the pipes are opened simultaneously , the empty tank will be filled in
1). 10 hours
2). 12 hours
3). 15 hours
4). $15\frac{1}{2}$ hours

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