X alone can do a work in 300 hours. Y alone can do the same work in 450 hours. X, Y and Z together can do the same work in 90 hours. In how many hours can Z alone do the work?

X alone can do a work in 300 hours. Y alone can do the same work in 450 hours. X, Y and Z together can do the same work in 90 hours. In how many hours can Z alone do the work?
1). 150
2). 180
3). 220
4). 200

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