A tank is fitted with two taps.The first tap can fill the tank completely in 45 minutes and the second tap can empty the full tank in one hour. If both the taps are opened alternately for one minute, then in how many hours the empty tank will be filled com- pletely

A tank is fitted with two taps.The first tap can fill the tank completely in 45 minutes and the second tap can empty the full tank in one hour. If both the taps are opened alternately for one minute, then in how many hours the empty tank will be filled com- pletely
1). 2 hours 55 minutes
2). 3 hours 40 minutes
3). 4 hours 48 minutes
4). 5 hours 53 minutes

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