Please solve Men and boys can both can do a work but with different efficiencies. Thirty men and 10 boys working together take 60 days to finish the job, whereas ten men and thirty boys working together take 120 days to finish it. How many days will thirty men working together (without any boys) take to finish it?

Please solve Men and boys can both can do a work but with different efficiencies. Thirty men and 10 boys working together take 60 days to finish the job, whereas ten men and thirty boys working together take 120 days to finish it. How many days will thirty men working together (without any boys) take to finish it?