A cistern can be filled with water by a pipe in 4 hours and second pipe can empty it in 5 hours. If both the pipes are opened simultaneously, Find the time in which Cistern will be filled?​​

A cistern can be filled with water by a pipe in 4 hours and second pipe can empty it in 5 hours. If both the pipes are opened simultaneously, Find the time in which Cistern will be filled?​​

1). 12 hours
2). 14 hours
3). 16 hours
4). 20 hours

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