Kapil, Mohan, and Raju can do a piece of work separately in 18, 36, and 54 days. They started the work together but Mohan left the work 8 days before the completion of work and Raju left the work 6 days before the completion of the work. Find the (approximate) time in which the work is completed.
1
19 days
2
13 days
3
15 days
4
12 days