Two pipes A and B can separately fill a tank in 2 hours and 3 hours respectively. If both the pipes are opened simultaneously in the empty tank, then the tank will be filled in

Two pipes A and B can separately fill a tank in 2 hours and 3 hours respectively. If both the pipes are opened simultaneously in the empty tank, then the tank will be filled in
1). 1 hour 12 minutes
2). 2 hours 30 minutes
3). 1 hour 15 minutes
4). 1 hour 20 minutes

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