Question: a can do a work in 30 days?
Answer: 30 *40 = 1200. In 1200 days , A will do 1200/30 = 40 works and B will do 1200/40 = 30 works.
1 work will be done in 1200/70 = 17.41 days. 4.8k views · View 4 Upvoters. Tikoo Sushil, worked at NAFED (1987-2010) Answered Sep 15, 2018 · Author has 87 answers and 39.1k answer views. A can do a piece of work in =30 days.