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Home Aptitude Time and Work See What Others Are Saying!
  • Question
  • A and B together can do a work in 8 days. If A alone can do it in 12 days, then in how many days can B alone do it?


  • Options
  • A. 12 days
  • B. 20 days
  • C. 24 days
  • D. 28 days

  • Correct Answer
  • 24 days 

    Explanation

    Required time taken by B to complete the work = xy / x - y
    [Here x = 12 and y = 8]
    ? required time = (12 x 8) / (12 - 8) = 96/4 = 24 days


  • More questions

    • 1. 
      A, B, C, D, E, F are the only six families in Indira Nagar. A, B, C, D, E and F has 7, 8, 10, 13, 6, and 10 member in their families respectively. If 1 member from all the six families left their respective families to accommodate themselves in the hostel of IIM Lucknow, then the average number of member now in each family of Indira nagar is

    • Options
    • A. 8
    • B. 9
    • C. 10
    • D. 13
    • Discuss
    • 2. 
      Find the number of diagonals formed in hexagon .

    • Options
    • A. 12
    • B. 10
    • C. 6
    • D. 9
    • Discuss
    • 3. If 5a = 3125, then the value of 5(a - 3) is:

    • Options
    • A. 25
    • B. 125
    • C. 625
    • D. 1625
    • Discuss
    • 4. 
      A parallelogram has sides 60 m and 40 m and one of the diagonal is 80 m long. Then its area is?

    • Options
    • A. 480 sq. m
    • B. 320 sq. m
    • C. 600? 15 sq. m
    • D. 450 ? 15 sq. m
    • Discuss
    • 5. 
      (9.95) 2 x (2.01) 3 = 2 x (?) 2

    • Options
    • A. 12
    • B. 15
    • C. 25
    • D. 20
    • Discuss
    • 6. 
      In how many ways, a cricket team of 11 players can be made from 15 players, if a particulars player is always chosen?

    • Options
    • A. 1835
    • B. 1001
    • C. 1635
    • D. 1365
    • Discuss
    • 7. In how many different ways can the letters of the word 'MATHEMATICS' be arranged so that the vowels always come together?

    • Options
    • A. 10080
    • B. 4989600
    • C. 120960
    • D. None of these
    • Discuss
    • 8. 
      A department had 8 male and female employees each. A project team involving 3 male and 3 female members needs to be chosen from the department employees. How many different projects teams can be chosen?

    • Options
    • A. 112896
    • B. 3136
    • C. 720
    • D. 112
    • Discuss
    • 9. 
      In how many different ways, 5 boys and 5 girls can sit on a circular table, so that the boys and girls are alternate?

    • Options
    • A. 2880
    • B. 2800
    • C. 2680
    • D. 2280
    • Discuss
    • 10. 
      If ABCD is a parallelogram and AC and BD be its diagonals, then:

    • Options
    • A. AB2 + BC2+ CD2+ DA2 = AC2 ? BD2
    • B. AB2 + BC2+ CD2 + DA2 = AC2 + BD2
    • C. 4AD2 = 2AC2 + 2BD2
    • D. 4AB2 = 2AC2 ? 2BC2
    • Discuss


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