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Home Aptitude Time and Work Comments

  • Question
  • A and B together can do a piece of work in 12 days, while B alone can finish it in 30 days. A alone can finish the work in?


  • Options
  • A. 15 days
  • B. 18 days
  • C. 20 days
  • D. 25 days

  • Correct Answer
  • 20 days 

    Explanation

    (A + B)'s 1 days work = 1/12
    B's 1 days work = 1/30
    ? A's 1 days work = 1/12 - 1/30 = (5 - 2)/60 = 1/20
    ? A alone can finish the work in 20 days.


  • Time and Work problems


    Search Results


    • 1. 
      A can complete a piece of work in 18 days and B can complete the same work in half time taken by A. Then, working together, what part of the same work they can complete in a day?

    • Options
    • A. 1/6
    • B. 1/9
    • C. 2/5
    • D. 2/7
    • Discuss
    • 2. 
      15 men complete a work in 16 days If 24 men are employed then the time require to complete that work will be

    • Options
    • A. 7 days
    • B. 8 days
    • C. 10 days
    • D. 12 days
    • Discuss
    • 3. 
      A and B together can do a work in 24 days. B alone does its 1/3 part in 12 days. How long will A alone take to do the remaining work?

    • Options
    • A. 48 days
    • B. 36 days
    • C. 24 days
    • D. 72 days
    • Discuss
    • 4. 
      A does half as much work as B in three-fourth of the time. If the together they take 18 days to complete a work. How much time shall B take to do it?

    • Options
    • A. 40 days
    • B. 35 days
    • C. 30 days
    • D. None of these
    • Discuss
    • 5. 
      The rates of working of A and B are in the ratio 3 : 4. The number of days taken by them to finish the work are in the ratio?

    • Options
    • A. 3 : 4
    • B. 9 : 16
    • C. 4 : 3
    • D. None of these
    • Discuss
    • 6. 
      Aarti can do a piece of work in 6 days. In how many days will she complete three time of work of same type?

    • Options
    • A. 18 days
    • B. 21 days
    • C. 3 days
    • D. 6 days
    • Discuss
    • 7. 
      A and B can do a piece of work in 6 and 12 days, respectively. They (both) will complete the work in how many days?

    • Options
    • A. 9 days
    • B. 18 days
    • C. 6 days
    • D. 4 days
    • Discuss
    • 8. 
      If 3 men and 4 boys can do a piece of work in 8 day, then 6 men and 8 boys can do the same work in?

    • Options
    • A. 2 days
    • B. 4 days
    • C. 6 days
    • D. 16 days
    • Discuss
    • 9. 
      'A' can do a piece of work in x days and B can do the same work 3x days. To finish the work together they take 12 days. What is the value of x?

    • Options
    • A. 8
    • B. 10
    • C. 12
    • D. 16
    • Discuss
    • 10. 
      X can completed a job in 12 days. If X and Y work together, they can complete the job in 6 2/ 3 days, Y alone can complete the job in

    • Options
    • A. 10 days
    • B. 12 days
    • C. 15 days
    • D. 18 days
    • Discuss


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