Question 316087
Viral -10 days 1 job
so he does 1/10 of the job in 1 day.
..
Raja -15 days - 1 job.
so he does 1/15 of the job in 1 day.
..
together they can do 1/10 + 1/15 of the job in 1 day.
LCM 30
3+2 /30 
=5/30
=1/6 job they can do in 1 day.
to complete the job they will take 6 days.

Ananth