Time and Work : 10 Questions Repeated in the Exams

Hi readers,
From past 5 years, I am analysing question papers of competitive examinations, specially banking exams. Today I am sharing 10 questions that are repeated in almost all the exams. 

==>> Read Time and Work Shortcuts here

Ques 1.

Randhir is 1 1/2 times faster than sudhir . If Randhir can complete a piece of work in 20 Days , how long will it take for both Randhir and Sudhir to complete the same piece of wrok ?

Ans 1.

Ques 2.

A can do a job in 24 days ,B in 9 days and C in 12 days. B and C together start the work but leave after 3 days . How much time was taken by A to complete the remaining work ?

Ans 2. 

Ques 3.

Ram is thrice as good a workman as Sham and is therefore able to finish a piece of work in 60 days less than B. Find the time in which they can do it, working together?

 Ans 3.

Ques 4.

If half of the plastering of a wall is done on the first day by a group of workers and one- fourth of the remaining on the second day, find the area of the wall , given that the work gets finished after plastering remaining 45 m2 of the wall .

Ans 4.

Ques 5.

9 men and 12 boys finish a job in 12 days. 12 men and 12 boys finish it in 10 days . In how many days will 10 men and 10 boys finish the job ?
(a) 8 days
(b) 10 days
(c) 12 days
(d) None of these

Ans 5. (c) 12 days

Here M and B give  the one  day's work of a man a boy respectively.

Ques 6.

A piece of work which could be finished in 9 days was finished 3 days earlier after 10 more men joined .The number of men employed was
(a) 18
(b) 20
(c) 22
(d) 24

Ans 6. (b) 20
Hint : 9x = 6  (  x + 10)

Ques 7.

If A,B and C together can finish a piece of work in 4 Days , A alone in 12 days and B in 18 Days, then C alone can do it in
(a) 21 days
(b) 15 days
(c) 12 days
(d) 9 days

Ans 7. (d) 9 days

Ques 8.

A can do half of a piece of work in one day whereas B can do full , B can do half the work as C in one day. Ratio of their efficiencies is
(a) 4 : 2 : 1
(b) 2 : 4 : 1
(c) 2 : 1 : 4
(d) 1 : 2 : 4

Ans 8. 1 : 2 : 4 
Hint :  Ratio  of their efficiencies = Ratio  of the  amount of work  they do in one day .

Ques 9.

If 5 men or 9 boys can do a piece of work in 15 days then 10 men 12 boys can finish the same work in
(a) 4 1/2
(b) 9 days
(c) 18 days
(d) 36 days

Ans 9. 

Ques 10.

Some persons can do a piece of work in 12 Days . Two times the number of these persons will do half of that work in
(a) 3 days
(b) 4 days
(c) 6 days
(d) 12 days

Ans 10. (a) 3 days