A and B together complete a work in 20 days. B alone complete the work in 30 days. Find in how many days A alone complete the work?

This question was previously asked in
RRB Clerk Prelims Memory Based Paper (Held On: 17 August 2024 Shift 4)
View all RRB Office Assistant Papers >
  1. 50
  2. 60
  3. 40
  4. 45
  5. 72

Answer (Detailed Solution Below)

Option 2 : 60
Free
Banking Special English For All Exam Test
10.2 K Users
20 Questions 20 Marks 12 Mins

Detailed Solution

Download Solution PDF

Calculation

Total work =  LCM of 20 and 30 = 60

Efficiency of B is 60 /30 = 2

Total Efficiency of A and B together is 60/20 = 3

So, efficiency of A is 3 -2 = 1

So, A alone complete the work in 60 / 1 = 60 days

Latest RRB Office Assistant Updates

Last updated on Jun 17, 2025

-> IBPS RRB Clerk Revised Exam Dates have been announced on 16th June 2025. 

-> According to the official notice, the Prelims Examination is scheduled to be conducted on 6th, 7th, 13th and 14th December 2025. 

->  The Mains Examination is scheduled for 1st February 2026. 

-> IBPS RRB Clerk 2025 Notification is expected to be released soon. 

-> Candidates with a Graduation degree in any discipline are eligible for the recruitment process. 

-> The selection process includes Prelims and Mains examinations.

-> Prepare for the Exam with IBPS RRB Clerk Previous Year Papers. Check IBPS RRB Clerk Exam Analysis.

-> Attempt Free Banking Current Affairs Mock Test here 

More Work Efficiency Questions

More Time and Work Questions

Get Free Access Now
Hot Links: teen patti neta teen patti wink teen patti gold new version 2024 dhani teen patti teen patti master golden india