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 tap can fill a cistern in 8 hours and another cn empty it in 16 hours. If both the taps are opened simultaneously, the time (in hours) to fill the tank is
8
10
16
24
A and B can do a piece of work in 18 days, B and C in 24 days; A and C in 36 days. In what time can they do it all working together:
16 days
13 days
26 days
12 days
A, B and C can do a piece of work in 6, 12 and 24 days respectively. They altogether will complete the work in
3 3/7 days
7/24 days
4 4/5 days
5/24 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 cistern can be filled by a pipe in 15 hours. But due to a leak in the bottom the cistern is just full in 20 hours. When the cistern is full, the leak can empty it in:
60 hours
40 hours
45 hours
30 hours
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?
15 days
18 days
A and B can together finish a work in 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?
40
50
54
60
A can do a piece of work in 30 days while B can do it in 40 days. A and B working together can do it in
70 days
42 3/4 days
27 1/7 days
17 1/7 days
Two pipes can fill a cistern in 9 hours and 12 hours respectively. In how much time will they fill the cistern when opened together?
2 1/3
5
3 2/3
5 1/7
