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RBI Grade B Time & Work Questions with Answers & Explanations

19 Time & Work questions from the Quantitative Aptitude section of RBI Grade B, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

A can complete a work in 10 days and B can complete it in 40 days. In how many days can they complete it working together?

  1. A25 days
  2. B10 days
  3. C12 days
  4. D8 days
  5. E7 days
Show answer
Answer: (D) 8 days Together they do 1/10 + 1/40 = 1/8 of the work per day, so 8 days.
Question 2

A can complete a work in 10 days and B can complete it in 15 days. In how many days can they complete it working together?

  1. A5 days
  2. B8 days
  3. C10 days
  4. D12.5 days
  5. E6 days
Show answer
Answer: (E) 6 days Together they do 1/10 + 1/15 = 1/6 of the work per day, so 6 days.
Question 3

A can complete a work in 10 days and B can complete it in 15 days. In how many days can they complete it working together?

  1. A10 days
  2. B5 days
  3. C8 days
  4. D6 days
  5. E12.5 days
Show answer
Answer: (D) 6 days Together they do 1/10 + 1/15 = 1/6 of the work per day, so 6 days.
Question 4

A can complete a work in 12 days and B can complete it in 36 days. In how many days can they complete it working together?

  1. A9 days
  2. B24 days
  3. C8 days
  4. D13 days
  5. E11 days
Show answer
Answer: (A) 9 days Together they do 1/12 + 1/36 = 1/9 of the work per day, so 9 days.
Question 5

A can complete a work in 6 days and B can complete it in 12 days. In how many days can they complete it working together?

  1. A4 days
  2. B6 days
  3. C3 days
  4. D8 days
  5. E9 days
Show answer
Answer: (A) 4 days Together they do 1/6 + 1/12 = 1/4 of the work per day, so 4 days.
Question 6

A can complete a work in 24 days and B can complete it in 40 days. In how many days can they complete it working together?

  1. A32 days
  2. B14 days
  3. C17 days
  4. D19 days
  5. E15 days
Show answer
Answer: (E) 15 days Together they do 1/24 + 1/40 = 1/15 of the work per day, so 15 days.
Question 7

A can complete a work in 21 days and B can complete it in 42 days. In how many days can they complete it working together?

  1. A13 days
  2. B31.5 days
  3. C14 days
  4. D18 days
  5. E16 days
Show answer
Answer: (C) 14 days Together they do 1/21 + 1/42 = 1/14 of the work per day, so 14 days.
Question 8

A can complete a work in 15 days and B can complete it in 30 days. In how many days can they complete it working together?

  1. A14 days
  2. B22.5 days
  3. C10 days
  4. D9 days
  5. E12 days
Show answer
Answer: (C) 10 days Together they do 1/15 + 1/30 = 1/10 of the work per day, so 10 days.
Question 9

A can complete a work in 20 days and B can complete it in 30 days. In how many days can they complete it working together?

  1. A14 days
  2. B25 days
  3. C11 days
  4. D12 days
  5. E16 days
Show answer
Answer: (D) 12 days Together they do 1/20 + 1/30 = 1/12 of the work per day, so 12 days.
Question 10

A can complete a work in 18 days and B can complete it in 36 days. In how many days can they complete it working together?

  1. A12 days
  2. B16 days
  3. C11 days
  4. D27 days
  5. E14 days
Show answer
Answer: (A) 12 days Together they do 1/18 + 1/36 = 1/12 of the work per day, so 12 days.

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Question 11

A can complete a work in 10 days and B can complete it in 40 days. In how many days can they complete it working together?

  1. A7 days
  2. B8 days
  3. C10 days
  4. D12 days
  5. E25 days
Show answer
Answer: (B) 8 days Together they do 1/10 + 1/40 = 1/8 of the work per day, so 8 days.
Question 12

A can complete a work in 12 days and B can complete it in 24 days. In how many days can they complete it working together?

  1. A8 days
  2. B18 days
  3. C12 days
  4. D10 days
  5. E7 days
Show answer
Answer: (A) 8 days Together they do 1/12 + 1/24 = 1/8 of the work per day, so 8 days.
Question 13

A can complete a work in 40 days and B can complete it in 60 days. In how many days can they complete it working together?

  1. A26 days
  2. B23 days
  3. C50 days
  4. D24 days
  5. E28 days
Show answer
Answer: (D) 24 days Together they do 1/40 + 1/60 = 1/24 of the work per day, so 24 days.
Question 14

A can complete a work in 30 days and B can complete it in 60 days. In how many days can they complete it working together?

  1. A19 days
  2. B24 days
  3. C22 days
  4. D20 days
  5. E45 days
Show answer
Answer: (D) 20 days Together they do 1/30 + 1/60 = 1/20 of the work per day, so 20 days.
Question 15

A can complete a work in 14 days and B can complete it in 35 days. In how many days can they complete it working together?

  1. A10 days
  2. B24.5 days
  3. C9 days
  4. D14 days
  5. E12 days
Show answer
Answer: (A) 10 days Together they do 1/14 + 1/35 = 1/10 of the work per day, so 10 days.
Question 16

A can complete a work in 20 days and B can complete it in 80 days. In how many days can they complete it working together?

  1. A18 days
  2. B50 days
  3. C16 days
  4. D15 days
  5. E20 days
Show answer
Answer: (C) 16 days Together they do 1/20 + 1/80 = 1/16 of the work per day, so 16 days.
Question 17

A can complete a work in 6 days and B can complete it in 12 days. In how many days can they complete it working together?

  1. A9 days
  2. B6 days
  3. C4 days
  4. D3 days
  5. E8 days
Show answer
Answer: (C) 4 days Together they do 1/6 + 1/12 = 1/4 of the work per day, so 4 days.
Question 18

A can complete a work in 18 days and B can complete it in 36 days. In how many days can they complete it working together?

  1. A14 days
  2. B16 days
  3. C11 days
  4. D27 days
  5. E12 days
Show answer
Answer: (E) 12 days Together they do 1/18 + 1/36 = 1/12 of the work per day, so 12 days.
Question 19

A can complete a work in 20 days and B can complete it in 80 days. In how many days can they complete it working together?

  1. A50 days
  2. B16 days
  3. C15 days
  4. D20 days
  5. E18 days
Show answer
Answer: (B) 16 days Together they do 1/20 + 1/80 = 1/16 of the work per day, so 16 days.

These are RankerClub practice questions written in the RBI Grade B pattern. They are not official SSC/IBPS/RRB papers.

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