Time and Work (Railway Maths) (Part – IV)

Total Questions: 50

21. A man and a boy, working together, can finish a task in 24 days. If, for the last 6 days, the man works alone, then the task can be finished in 26 days. In how many days can the boy alone finish the task ? [RRB NTPC 01/03/2021 (Morning) ]

Correct Answer: (d) 72
Solution:

22. A can complete a certain job in 18 days. B is 40% more efficient than A. How many days will B alone take to complete the same job ? [RRB NTPC 01/03/2021 (Evening) ]

Correct Answer: (c)
Solution:

23. A can complete a task in 20 days. B is 75% more efficient than A. the number of days B will take to complete the same work is : [RRB NTPC 02/03/2021 (Evening) ]

Correct Answer: (b)
Solution:

24. 2 men and 3 boys can complete a piece of work in 18 days while 3 men and 2 boys can complete the same work in 15 days. In how many days will 4 men and 2 boys complete the work ? [RRB NTPC 02/03/2021 (Evening) ]

Correct Answer: (b)
Solution:

25. Worker A is thrice as efficient as worker B. They can together finish a task in 18 days. How many days will A alone take to finish the work? [RRB NTPC 03/03/2021 (Morning)]

Correct Answer: (a) 24 days
Solution:

26. A and B together can do a piece of work in 21 days. With the help of C, they can finish it in 14 days. In how many days will C alone be able to finish the work? [RRB NTPC 03/03/2021 (Evening)]

Correct Answer: (c) 42 days
Solution:

27. To complete a given task, Imran takes 11 days, Tahir takes 15 days and Amla takes 13 days. Working together they finish the task and get Rs. 2,012. What will be the share of Imran provided the daily wage is the same for all? [RRB NTPC 04/03/2021 (Morning)]

Correct Answer: (a) Rs.780
Solution:

28. If Ramu, Rohit and Shyam together can finish a piece of work in 8 days. Ramu alone can complete this work in 16 days and Rohit in 24 days, then Shyam alone can finish this work in how many days? [RRB NTPC 04/03/2021 (Evening)]

Correct Answer: (d) 48
Solution:

29. If Raju is thrice as good a workman as Ravi and takes 20 days less than him to complete a piece of work, then find the time taken by Ravi to complete the work. [RRB NTPC 05/03/2021 (Morning) ]

Correct Answer: (d) 30 days
Solution:

30. Ramu and Somu together can complete a task in 10 days. Somu and Dhamu together can complete it in 12 days. Dhamu and Ramu together can complete it in 15 days. If Ramu, Somu and Dhamu work together, in how many days will they complete the task ? [RRB NTPC 05/03/2021 (Evening) ]

Correct Answer: (d) 8
Solution: