Three taps A, B and C together can completely fill a tank in 30 minutes. B and C together can fill the same tank in 45 minutes. In how much time (in minutes) A alone can fill the tank?

Three taps A, B and C together can completely fill a tank in 30 minutes. B and C together can fill the same tank in 45 minutes. In how much time (in minutes) A alone can fill the tank?
1). 120
2). 90
3). 150
4). 80

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