RRB NTPC · Question 66
Working together, P, Q and R reap a field in 6 days. If P can do it alone in 10 days and Q in 24 days, in how many days will R alone be able to reap the field? A. 32 days B. 40 days C. 45 days D. 60 days
Show answer & explanation
Answer: (D) B
Explanation
R's daily rate = 1/6 − 1/10 − 1/24. Over a common denominator of 120: (20 − 12 − 5)/120 = 3/120 = 1/40. So R alone takes 40 days.