Quantitative Aptitude :: Time and Work Problems And Answers

Time and Work Formulaes

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21. P can complete work in 12 days working 8 hrs a day. Q can complete the same work in 8 days working10 hrs a day. If both P and Q working 8 hrs a day in how many days can they complete the work?

A. 5 6/11 B. 6 5/11   
C. 5 5/11    D. 6 6/11

22. A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days In what time can A alone do it?
 

A. 80 B. 100
C. 120 D. 150

23. A and B can do a piece of work in 5 days; B and C can do it in 7 days and A and C can do it in 4 days who among these will take least time if put to do it alone?

A. A B. B
C. C D. data inadequate
 

24. A can do a piece of work in 4hrs.B and C together can do it 3 hrs while A  and C can do it in 2 hrs how long it will take for B?
 

A. 8 B. 10
C. 12 D. 24

25. A can do piece of work in same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days then B alone could do it in?

A. 15 B. 20
C. 25 D. 30

26. A is thrice good a workman as B and therefore is able to finish a job in 60 days less than B. Working together they can do it in?
 

A. 20 B. 22 ½
C. 25   D. 30
 

27. A is 30% more efficient than B. How much time will they working together take to complete a job which A alone could have done in 23 days?

A. 11 B. 13     
C. 20 3/17           D. None of these
 

28. A can do a work in 15 days and B in 20 days. If they work on it together for 4 days then the fraction of the work that is left is?
 

A. 1/4  B. 1/10      
C. 7/15     D. 8/15

29. X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days how long will they work together take to complete the work?
 

A. 13 1/3 B. 15
C. 20 D. 56

30. A alone can complete a work in 16 days and B alone can complete in 12 days. Starting with A they work on alternate days. The total work will be completed in?
 

A. 12  B. 13
C. 13 5/7       D. 13 ¾
 




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