L alone can do a work in 100 hours. M alone can do the same in 150 hours. L, M and N together can do the same work in 30 hours. In how many hours can N alone do the work?

L alone can do a work in 100 hours. M alone can do the same in 150 hours. L, M and N together can do the same work in 30 hours. In how many hours can N alone do the work?
1). 65
2). 60
3). 40
4). 90

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