Time and Work

1.A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?

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

2.A can finish a work in 18 days and B can do the same work in 15 days. B worked for 10 days and left the job. In how many days, A alone can finish the remaining work?

A. 5 B. 5 1 2 C. 6 D. 8

3.10 women can complete a work in 7 days and 10 children take 14 days to complete the work. How many days will 5 women and 10 children take to complete the work?

A. 3 B. 5 C. 7 D. Cannot be determined

4.Ravi and Kumar are working on an assignment. Ravi takes 6 hours to type 32 pages on a computer, while Kumar takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages?

A. 7 hours 30 minutes B. 8 hours C. 8 hours 15 minutes D. 8 hours 25 minutes

5.Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is:

A. 15 B. 16 C. 18 D. 25

6.A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in:

A. 4 days B. 6 days C. 8 days D. 12 days

7.A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:

A. 9 1 days 5 B. 9 2 days 5 C. 9 3 days 5 D. 10

 8.A and B can together complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?

A.4 days                     B.5 days

.

C.6 days                      D. 7 days

9.A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work ?

A.5 days                   B. 6 days

C.7 days                   D. 8 days

10.A & B working alone can do a work in 9 and 12 days respectavily. If they work for a day alternately, A beginning, in how many days the work will be completed? 

  A.10 ¼ days                                    B. 10 ½ days

C.10 1/3 days              D.10 1/6 days

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

A.                 13 ¼ days                       B. 13 ½ days

C.         13 ¾ days                      D. 13 4/4 days

12.Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank in gallons is

	A.	100                      B.110
	C.	120                      D.140

13.Due to hole at the bottom of the tank, a tap takes 2 more minutes to completely fill the tank. Due to leakage of water through this hole, a bucket filled completely with water gets emptied in 4 minutes. In how much time can the tap fill the tank, if there was no hole at the bottom at the tank?

         A.8 min           B. 2min

         C. 4 min           D. 6 min

14.A red light flashes 3 times per minute and a green light flashes 5 times in two minutes at regular intervals. If both lights start flashing at the same time, how many times do they flash together in each hour?

	A.	30
	B.	29
	C.	31
	D.	32
15.Ram, who is half as efficient as Krish, will take 24 days to complete a work if he worked alone. If Ram and Krish worked together, how many days will they take to complete the work?

	A.	16
	B.	12
	C.	8
	D.	18