P and Q can finish a work together in 30 hours. Q, R and S can finish the same work in 20 hours. And when all four of them work together, they finish the work in 15 hours. In how many hours can Q finish the work alone?

P and Q can finish a work together in 30 hours. Q, R and S can finish the same work in 20 hours. And when all four of them work together, they finish the work in 15 hours. In how many hours can Q finish the work alone?

1). 40
2). 45
3). 60
4). 72

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