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SBI PO Time & Work Questions with Answers & Explanations

20 Time & Work questions from the Quantitative Aptitude section of SBI PO, 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 21 days and B can complete it in 42 days. In how many days can they complete it working together?

  1. A16 days
  2. B14 days
  3. C31.5 days
  4. D13 days
  5. E18 days
Show answer
Answer: (B) 14 days Together they do 1/21 + 1/42 = 1/14 of the work per day, so 14 days.
Question 2

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. C15 days
  4. D17 days
  5. E19 days
Show answer
Answer: (C) 15 days Together they do 1/24 + 1/40 = 1/15 of the work per day, so 15 days.
Question 3

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. A25 days
  2. B12 days
  3. C16 days
  4. D14 days
  5. E11 days
Show answer
Answer: (B) 12 days Together they do 1/20 + 1/30 = 1/12 of the work per day, so 12 days.
Question 4

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. A24.5 days
  2. B12 days
  3. C14 days
  4. D10 days
  5. E9 days
Show answer
Answer: (D) 10 days Together they do 1/14 + 1/35 = 1/10 of the work per day, so 10 days.
Question 5

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. A10 days
  2. B18 days
  3. C12 days
  4. D8 days
  5. E7 days
Show answer
Answer: (D) 8 days Together they do 1/12 + 1/24 = 1/8 of the work per day, so 8 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. A17 days
  2. B15 days
  3. C14 days
  4. D19 days
  5. E32 days
Show answer
Answer: (B) 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 20 days and B can complete it in 80 days. In how many days can they complete it working together?

  1. A16 days
  2. B20 days
  3. C18 days
  4. D15 days
  5. E50 days
Show answer
Answer: (A) 16 days Together they do 1/20 + 1/80 = 1/16 of the work per day, so 16 days.
Question 8

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. A8 days
  2. B4 days
  3. C3 days
  4. D9 days
  5. E6 days
Show answer
Answer: (B) 4 days Together they do 1/6 + 1/12 = 1/4 of the work per day, so 4 days.
Question 9

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. A24 days
  2. B8 days
  3. C13 days
  4. D9 days
  5. E11 days
Show answer
Answer: (D) 9 days Together they do 1/12 + 1/36 = 1/9 of the work per day, so 9 days.
Question 10

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. A23 days
  2. B28 days
  3. C50 days
  4. D24 days
  5. E26 days
Show answer
Answer: (D) 24 days Together they do 1/40 + 1/60 = 1/24 of the work per day, so 24 days.

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Question 11

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. A22.5 days
  2. B10 days
  3. C14 days
  4. D9 days
  5. E12 days
Show answer
Answer: (B) 10 days Together they do 1/15 + 1/30 = 1/10 of the work per day, so 10 days.
Question 12

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. B10 days
  3. C8 days
  4. D25 days
  5. E12 days
Show answer
Answer: (C) 8 days Together they do 1/10 + 1/40 = 1/8 of the work per day, so 8 days.
Question 13

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. A16 days
  2. B31.5 days
  3. C13 days
  4. D14 days
  5. E18 days
Show answer
Answer: (D) 14 days Together they do 1/21 + 1/42 = 1/14 of the work per day, so 14 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. A22 days
  2. B19 days
  3. C45 days
  4. D20 days
  5. E24 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 10 days and B can complete it in 15 days. In how many days can they complete it working together?

  1. A8 days
  2. B10 days
  3. C12.5 days
  4. D5 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 16

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. A27 days
  2. B16 days
  3. C12 days
  4. D11 days
  5. E14 days
Show answer
Answer: (C) 12 days Together they do 1/18 + 1/36 = 1/12 of the work per day, so 12 days.
Question 17

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. A10 days
  2. B12 days
  3. C7 days
  4. D25 days
  5. E8 days
Show answer
Answer: (E) 8 days Together they do 1/10 + 1/40 = 1/8 of the work per day, so 8 days.
Question 18

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. A8 days
  2. B6 days
  3. C4 days
  4. D9 days
  5. E3 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 19

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. A13 days
  2. B11 days
  3. C8 days
  4. D24 days
  5. E9 days
Show answer
Answer: (E) 9 days Together they do 1/12 + 1/36 = 1/9 of the work per day, so 9 days.
Question 20

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. A12 days
  2. B14 days
  3. C16 days
  4. D25 days
  5. E11 days
Show answer
Answer: (A) 12 days Together they do 1/20 + 1/30 = 1/12 of the work per day, so 12 days.

These are RankerClub practice questions written in the SBI PO pattern. They are not official SSC/IBPS/RRB papers.

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