If A can do a piece of work in 5 days, and B can do it in 10 days. How long will they take if both work together ?
A's 1 day work= 1/5th of Whole Work
B's 1 day work= 1/10th of Whole Work
A+B 's 1 day work= 1/5 +1/10 = 15/50th part of whole work
A+B together= 50/15 = 3 5/15 days
