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RRB NTPC Time and Work — practice questions — page 2

Explore 78 free Time and Work questions in RRB NTPC Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

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Time and Work questions and exercises with answers

Showing questions 31–60 of 78.

Ten women can finish a job in 24 days. After 6 days five women leave. The rest of the job takesRead the answer and worked solution →A team of 15 workers can finish a job in 30 days. After 10 days, 5 more workers join. The remaining work takesRead the answer and worked solution →Twelve men could complete a job in 20 days. After 5 days, 6 men leave. The remaining work takesRead the answer and worked solution →One man equals two women in work. Six men finish a job in 10 days. Eight women needRead the answer and worked solution →A man does as much as 3 boys. Two men and 6 boys finish a job in 9 days. How long would 12 boys take?Read the answer and worked solution →A can do a job in 15 days and B in 10 days. A works alone for 5 days, then B joins. B works with A forRead the answer and worked solution →A takes 10 days and B takes 15 days. Working on alternate days, A first, they complete the job inRead the answer and worked solution →If a worker completes one third of a job in 5 days, the whole job takes himRead the answer and worked solution →A mason completes 40% of a wall in 8 days. At this pace the whole wall takesRead the answer and worked solution →A labourer finishes 3/4 of a job in 15 days. To complete the remaining part he needsRead the answer and worked solution →Two pipes fill a tank in 20 and 30 hours, and a third empties it in 60 hours. All open, it fills inRead the answer and worked solution →A tank normally fills in 6 hours but a leak makes it 8 hours. The leak alone empties a full tank inRead the answer and worked solution →A pump fills a tank in 5 hours, but with a leak it takes 6 hours. The leak alone would empty it inRead the answer and worked solution →Pipes fill a tank in 8 and 12 hours. Both open for 2 hours, then the first closes. The second needs moreRead the answer and worked solution →A pipe adds 25 litres a minute, a leak drains 5 litres a minute. A 400 litre tank fills inRead the answer and worked solution →A task needing 20 man-hours is done by a team of 5 equally able people inRead the answer and worked solution →A job needs 60 man-hours. Six equally efficient workers will finish it inRead the answer and worked solution →Eight workers each put in 9 hours on a task. The man-hours spent in all areRead the answer and worked solution →The work of 4 men for 15 days equals how many man-days?Read the answer and worked solution →A task needs 240 man-hours. Working 8 hours a day, how many workers finish it in 5 days?Read the answer and worked solution →A task takes 100 man-hours. Five workers put in 4 hours a day, so it takesRead the answer and worked solution →Which of these is left out when counting man-hours?Read the answer and worked solution →The work performed by an average worker during one day is called aRead the answer and worked solution →Two bricklayers need 14 and 21 days respectively for a wall. Working together they needRead the answer and worked solution →A takes 6 days less than B alone, and together they finish in 4 days. B alone takesRead the answer and worked solution →P works three times as fast as Q, and P finishes 20 days sooner than Q alone. P alone needsRead the answer and worked solution →P is three times as efficient as Q, and together they finish in 15 days. P alone needsRead the answer and worked solution →A and B are paid Rs 1200 for a job. A alone does it in 6 days, B alone in 12 days. A getsRead the answer and worked solution →A, B and C take 10, 15 and 30 days alone and share Rs 3000 for working together. C getsRead the answer and worked solution →Two workers earn Rs 2400 at equal daily wages. One works 6 days and the other 4 days. The first getsRead the answer and worked solution →

Worked practice questions

Ten women can finish a job in 24 days. After 6 days five women leave. The rest of the job takes

  1. 24 days
  2. 36 days
  3. 30 days
  4. 40 days
Show answer and solution

Correct answer: B. 36 days

After 6 days, 18 days of work for 10 women (180 woman-days) remain, and 5 women need 180/5 = 36 days.

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A team of 15 workers can finish a job in 30 days. After 10 days, 5 more workers join. The remaining work takes

  1. 18 days
  2. 15 days
  3. 12 days
  4. 10 days
Show answer and solution

Correct answer: B. 15 days

Remaining work is 15 x 20 = 300 worker-days, and 20 workers finish it in 15 days.

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Twelve men could complete a job in 20 days. After 5 days, 6 men leave. The remaining work takes

  1. 40 days
  2. 25 days
  3. 30 days
  4. 20 days
Show answer and solution

Correct answer: C. 30 days

Work left is 12 x 15 = 180 man-days, and 6 men need 180/6 = 30 days.

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