S can complete a task in 50 days, T can complete it in 40 days and M can complete it in 30 days. S can work on all days of the week; T can work only on Monday, Wednesday, and Friday while M can work only on Saturday and Sunday. The work is started on Monday. In how many weeks it will be completed?
1
Between 4 to 5 weeks
2
Exactly 3 weeks
3
Between 3 to 4 weeks
4
Between 2 to 3 weeks