>> Aptitude >> Time and work
1). A and B together can do a piece of work in 12 days, while B alone can do finish it in 30 days. A alone can finish the work in
A). 15 days B). 18 days
C). 20 days D). 25 days
2). A and B can do a piece of work in 6 and 12 days, respectively. They (both) will complete the work in how many days?
A). 9 days B). 18 days
C). 6 days D). 4 days
3). A alone can complete a work in 12 days and B alone can complete the same work in 24 days. In how many days can A and B together complete the same work?
A). 6 days B). 4 days
C). 10 days D). 8 days
4). A can do a piece of work in x days and B can do the same work 3x days. To finish the work together they take 12 days. What is the value of x?
A). 8 B). 10
C). 12 D). 16
5). A can do a piece of work in 4 days and B can complete the same work in 12 days. What is the number of days required to do the same work together?
A). 2 days B). 3 days
C). 4 days D). 5 days
6). A can do a piece of work in 8 days, B can do it in 10 days and C can do it in 20 days. In how many days can A, B and C together complete the work?
A). 3-7 days 11 B). 11 days
C). 3A days 11 D). 3-9 days 11
7). A and B can do a piece of work in 72 days. B and C can do it in 120 days. A and C can do it in 90 days. In what time can A alone do it?
A). 80 days B). 100 days
C). 120 days D). 150 days
8). A and B can do a piece of work in 10 h, B and C can do it in 15 h, while A and C take 12 h to complete the work. B independently can complete the work in
A). 12 h B). 16 h
C). 20 h D). 24 h
9). A can do a piece of work in 10 days and B in 20 days. They begin together but A leaves 2 days before the completion of the work. The whole work will be done in
A). 8 days B). 7 days
C). 7(2/3) days D). 6 days
10). A and B together can complete a work in 3 days. They started together but after 2 days, B left the work. If the work is completed after 2 more days, B alone could do the work in how many days?
A). 5 B). 6
C). 7 D). 10