Three taps A,B and C together can fill an empty cistern in 10 minutes.The tap A alone can fill it in 30 minutes and the tap B alone in 40 minutes. How long will the tap C alone take to fill it

Three taps A,B and C together can fill an empty cistern in 10 minutes.The tap A alone can fill it in 30 minutes and the tap B alone in 40 minutes. How long will the tap C alone take to fill it
1). 16 minutes
2). 24 minutes
3). 32 minutes
4). 40 minutes

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