Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes. C is also opened. The tank is filled up in

Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes. C is also opened. The tank is filled up in
1). 39 minutes
2). 46 minutes
3). 40 minutes
4). 45 minutes

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