Time and Work - Teacher

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

• 1/4

• 1/10

• 7/15

• 8/15

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:

• 46/5

• 47/5

• 48/5

• 10

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

• 12 Days

• 15 Days

• 16 Days

• 18 Days

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

• 20 days

• 45/2 days

• 25 days

• 30 days

A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?

• Rs.375

• Rs.400

• Rs.600

• Rs.800

If 6 men and 8 boys can do a piece of work in 10 days while 26 men and 48 boys can do the same in 2 days, the time taken by 15 men and 20 boys in doing the same type of work will be:

• 4 days

• 5 days

• 6 days

• 7 days

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?

• 8 hours

• 10 hours

• 12 hours

• 24 hours

A can do a certain work in the 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:

• 15 days

• 20 days

• 25 days

• 30 days

A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

• 23 days

• 37 days

• 75/2

• 40 days

A machine P can print one lakh books in 8 hours, machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M. while machine P is closed at 11 A.M. and the remaining two machines complete work. Approximately at what time will the work (to print one lakh books) be finished?

• 11:30 AM

• 12 Noon

• 12:30 PM

• 1:00 PM