A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed , how long will it take for the tank to be full

A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed , how long will it take for the tank to be full
1). 20 minutes
2). 25 minutes
3). 30 minutes
4). 45 minutes

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