Two pipes can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all the three pipes are kept open , then the cistern will be filled in :

Two pipes can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all the three pipes are kept open , then the cistern will be filled in :
1). 5 hours
2). 8 hours
3). 10 hours
4). 12 hours

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