Time & Work-1

1.  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 : A. 1 4 B. 1 10 C. 7 15 D. 8 15 View Answer 2.  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 View Answer 3.  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? A. 12 days B. 15 days C. 16 days D. 18 days View Answer 4.  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: A. 20 days B. 22 1 days 2 C. 25 days D. 30 days View Answer 5.  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? A. Rs. 375 B. Rs. 400 C. Rs. 600 D. Rs. 800 View Answer