Sahil, Shahid and Salman can do a work in 12, 15 and 30 days respectively, working 12 hours in a day. Work is to be done in two shifts, Morning shift is of 8 hours and evening shift is of 4 hours. Sahil starts from the morning shift and they changes their shift alternatively ( i.e., Sahil works in morning shift then Shahid in evening shift and Salman in morning shift of next day and so on. ) On which day the work will get completed and in which shift?