RRB NTPC · Question 19
If X and Y can complete a piece of work in 15 days, and X alone can do the same work in 30 days, find how many days will Y alone take to complete the same work?
Show answer & explanation
Answer: (C) 30 days
Explanation
Y's one-day work = 1/15 − 1/30 = 1/30, so Y alone takes 30 days.