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
Rahul can do a piece of work in 20 days while Santhosh can do it in 12 days. Santhosh worked at it for 9 days and left. Rahul can finish the remaining work in
11 days
7 days
5 days
3 days
Two pipes A and B also can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe at the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 minutes. In how much time can the third alone empty the cistern?
110 minutes
100 minutes
120 minutes
90 minutes
A tap can empty a tank in one hour . A second tap can empty it in 30 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank?
20 minute
30 minute
40 minute
45 minute
A and B can do a piece of work in 45 and 40 days respectively. They began to work together but A leaves after sometime and B finished the remaining work in 23 days. After how many days did A leave?
6 days
8 days
9 days
12 days
A can finish a work in 18 days and B can do the same work in 15 days. B worked 10 days and left the job. In how many days, A alone can finish the remaining work?
5
5 1/2
6
8
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
3 2/3
5 1/7
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
10
16
24
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, 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
16 days
18 days