R d sharma solutions mathematics class 8 Solutions for Chapter 11 time and work

Exercises in Chapter 11 time and work Grade 8

Time and Work Exercise 11.1

Questions in Time and Work Exercise 11.1

Rakesh can do a piece of work in 20 days. How much work can he do in 4 days?

Rohan can paint 1/3 of a painting in 6 days. How many days will he take tocomplete painting?

Anil can do a piece of work in 5 days and Ankur in 4 days. How long will theytake do the same work, if they work together?

Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow in 4hours. How long will Sohan take to mow the lawn if he works alone?

Sita can finish typing a 100 page document in 9 hours, Mita in 6 hours and Rita in12 hours. How long will they take to type a 100 page document if they worktogether?

A, B and C working together can do a piece of work in 8 hours. A alone can do itin 20 hours and B alone can do it in 24 hours. In how many hours will C alone dothe same work?

A and B can do a piece of work in 18 days; B and C in 24 days and A and C in 36days. In what time can they do it, all working together?

A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20days. How much time will A alone take to finish the work?

A, B and C can reap a field in 15 ¾ days; B, C and D in 14 days; C, D and A in 18days; D, A and B in 21 days. In what time can A, B, C and D together reap it?

A and B can polish the floors of a building in 10 days. A alone can do ¼th of it in12 days. In how many days can B alone polish the floor?

A and B can finish a work in 20 days. A alone can do 1/5th of the work in 12days. In how many days can B alone do it?

A and B can do a piece of work in 20 days and B in 15 days. They work togetherfor 2 days and then A goes away. In how many days will B finish the remainingwork?

A can do a piece of work in 40 days and B in 45 days. They work together for 10days and then B goes away. In how many days will A finish the remaining work?

A and B can do a piece of work in 6 days and 4 days respectively. A started thework, worked at it for 2 days and then was joined by B. Find the total time taken tocomplete the work.

6 men can complete the electric fitting in a building in 7 days. How many dayswill it take if 21 men do the job?

8 men can do a piece of work in 9 days. In how many days will 6 men do it?

Reema weaves 35 baskets in 25 days. In how many days will she weave 55baskets?

Neha types 75 pages in 14 hours. How many pages will she type in 20 hours?

If 12 boys earn Rs 840 in 7 days, what will 15 boys earn in 6 days?

If 25 men earn Rs 1000 in 10 days, how much will 15 men earn in 15 days?

Working 8 hours a day, Ashu can copy a book in 18 days. How many hours aday should he work so as to finish the work in 12 days?

If 9 girls can prepare 135 garlands in 3 hours, how many girls are needed toprepare 270 garlands in 1 hour?

A cistern can be filled by one tap in 8 hours, and by another in 4 hours. Howlong will it take to fill the cistern if both taps are opened together?

Two taps A and B can fill an overhead tank in 10 hours and 15 hoursrespectively. Both the taps are opened for 4 hours and then B is turned off. Howmuch time will A take to fill the remaining tank?

A pipe can fill a cistern in 10 hours. Due to a leak in the bottom it is filled in 12hours. When the cistern is full, in how much time will it be emptied by the leak?

A cistern has two inlets A and B which can fill it in 12 hours and 15 hoursrespectively. An outlet can empty the full cistern in 10 hours. If all the three pipesare opened together in the empty cistern, how much time will they take to fill thecistern completely?

A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 6hours. How long will it take to fill the cistern if both the tap and the pipe are openedtogether?