If Mohit, Nitu and Soma can complete a piece of work in 5 days, 6 days and 8 days, respectively, then in how many days will the work be completed if they work on alternate days starting with Mohit on first day, then Nitu on second day. then Soma on third day, then Mohit on fourth day and so on.

Correct option is D

Efficiency of Mohit = $$\frac{120}{5} = 24 \,unit\, per\, day$$

Efficiency of Nitin = $$\frac{120}{6} = 20 \,unit\, per\, day$$​

Efficiency of Soma = $$\frac{120}{8} = 15 \,unit\, per\, day$$​