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Important Formulas

Problems on Time and Work

Q1. A can do a work in 4 days and B can do the same work in 3 days. How long it will take if both A and B do the work together ?
(a) 1 days
(b) 1 days 5/7 hours
(c) 2 days 3 hours
(d) 3 days

Q2. A and B complete a work in 6 days. If can A can complete the work in 14 days, in how many days B alone can do the same work.
(a) 1 days
(b) 1 days 5/7 hours
(c) 2 days 3 hours
(d) 3 days

Q3. A and B can complete a work in 30 days, while B and C do the same work in 24 days and C and A do the same work on 20 days. They all work together for 10 days and after that B and C leave the work. How many days more will A take to finish the work ?
(a) 12 days
(b) 13 days
(c) 16 days
(d) 18 days

Q4. A can do a piece of work in 20 days. He works it for 4 days and then B finish the work in 12 days. How long will it takes if both A and B works together ?
(a) 6 days
(b) 8.5 days
(c) 10.3 days
(d) 12 days

Q5. A and B together can complete a piece of work in 72 days, B and C together in 120 days and A and C together in 90 days. A, B and C together can complete the work in ?
(a) 35 days
(b) 40 days
(c) 48 days
(d) 60 days



Q6. A can complete a work in 2 days and B can complete the work in 3 days. With the help of C they together completed in 1 day. C alone can complete the work in ?
(a) 2 days
(b) 4 days
(c) 6 days
(d) 7 days

Q7. A can complete a work in 15 days and B can complete the work in 20 days. If B works for 8 days and left the job, then in how many days the A can complete the remaining job ?
(a) 6 days
(b) 7 days
(c) 8 days
(d) 9 days

Q8. Ram and Rohit together can finish a job in 10 days. Ram can do the same job on his own in 12 days. How long will Rohit take to do the job by himself
(a) 40 days
(b) 60 days
(c) 80 days
(d) 100 days

Q9. A does 20% less work than B. If A can complete a piece of work in 7(1/2) hours, then B can do it in
(a) 4 hrs
(b) 5 hrs
(c) 6 hrs
(d) 8 hrs

Q10. 4 men or 6 women can do a work in 12 days. How long will 6 men and 6 women take to finish the work
(a) 4 days
(b) 4(4/5) days
(c) 5(1/2) days
(d) 4(1/2) days


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