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Important Formulas

Problems on Time and Work

Q11. 10 men can finish the construction of a wall in 12 days. How many men are added to finish the work in half a day ?
(a) 120
(b) 220
(c) 230
(d) 240

Q12. 20 men complete one third of a piece of work in 20 days. How many more men should be employed to finish the rest of the work in 25 more days ?
(a) 12
(b) 15
(c) 22
(d) 25

Q13. If 36 men can do a piece of work in 25 days, in how many days will 12 men do it ?
(a) 35
(b) 56
(c) 75
(d) 80

Q14. The A Minar casts a shadow of 180m long at the same time when the B Minar casts a shadow of 120m long on the ground. If the height of the B Minar is 80m, what is the height of the A minar ?
(a) 105m
(b) 115m
(c) 120m
(d) 135m

Q15. 6 men can finish a piece of work in 30 days. If 3 men more join with them then the work will be completed in
(a) 18
(b) 20
(c) 22
(d) 24



Q16. 10 women can complete a work in 6 days and 10 children take 12 days to complete the work. How many days will 6 women and 4 children together take to complete the work ?
(a) 7½ days
(b) 8½ days
(c) 9½ days
(d) 10½ days

Q17. 5 men can complete a work in 10 days and the same work 6 women can complete in 15 days. How many days will 2 men and 3 women together take to complete the work ?
(a) 12(3/11) days
(b) 13(7/11) days
(c) 15(3/7) days
(d) 16(5/11) days

Q18. Ram can do a work in 15 days. Rahim is 50% more efficient than Ram. The number of days, Rahim will take to do the same piece of work is
(a) 7 days
(b) 8 days
(c) 10 days
(d) 13 days

Q19. Hari can do a work in 28 days. Jadu is 40% more efficient than Hari. The number of days, Jadu will take to do the same piece of work is
(a) 8 days
(b) 10 days
(c) 15 days
(d) 20 days

Q20. A works twice fast as B. If both of them can together finish a piece of work in 15 days then B alone can do it in
(a) 28 days
(b) 33 days
(c) 37 days
(d) 45 days



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